diff --git a/src/plugins/git/giteditor.cpp b/src/plugins/git/giteditor.cpp
index b1520aebc80..01aa5234720 100644
--- a/src/plugins/git/giteditor.cpp
+++ b/src/plugins/git/giteditor.cpp
@@ -290,9 +290,9 @@ void GitEditorWidget::init()
     VcsBase::VcsBaseEditorWidget::init();
     Core::Id editorId = editor()->document()->id();
     if (editorId == Git::Constants::GIT_COMMIT_TEXT_EDITOR_ID)
-        new GitSubmitHighlighter(textDocument());
+        textDocument()->setSyntaxHighlighter(new GitSubmitHighlighter);
     else if (editorId == Git::Constants::GIT_REBASE_EDITOR_ID)
-        new GitRebaseHighlighter(textDocument());
+        textDocument()->setSyntaxHighlighter(new GitRebaseHighlighter);
 }
 
 void GitEditorWidget::addDiffActions(QMenu *menu, const VcsBase::DiffChunk &chunk)
diff --git a/src/plugins/git/githighlighters.cpp b/src/plugins/git/githighlighters.cpp
index aca4944cfc9..d87a0d456d1 100644
--- a/src/plugins/git/githighlighters.cpp
+++ b/src/plugins/git/githighlighters.cpp
@@ -40,17 +40,6 @@ static const char CHANGE_PATTERN[] = "\\b[a-f0-9]{7,40}\\b";
 
 GitSubmitHighlighter::GitSubmitHighlighter(QTextEdit * parent) :
     TextEditor::SyntaxHighlighter(parent)
-{
-    initialize();
-}
-
-GitSubmitHighlighter::GitSubmitHighlighter(TextEditor::BaseTextDocument *parent) :
-    TextEditor::SyntaxHighlighter(parent)
-{
-    initialize();
-}
-
-void GitSubmitHighlighter::initialize()
 {
     static QVector<TextEditor::TextStyle> categories;
     if (categories.isEmpty())
@@ -108,7 +97,7 @@ GitRebaseHighlighter::RebaseAction::RebaseAction(const QString &regexp,
 {
 }
 
-GitRebaseHighlighter::GitRebaseHighlighter(TextEditor::BaseTextDocument *parent) :
+GitRebaseHighlighter::GitRebaseHighlighter(QTextDocument *parent) :
     TextEditor::SyntaxHighlighter(parent),
     m_hashChar(QLatin1Char('#')),
     m_changeNumberPattern(QLatin1String(CHANGE_PATTERN))
diff --git a/src/plugins/git/githighlighters.h b/src/plugins/git/githighlighters.h
index de77e975af4..c9aa130586a 100644
--- a/src/plugins/git/githighlighters.h
+++ b/src/plugins/git/githighlighters.h
@@ -32,8 +32,6 @@
 
 #include <texteditor/syntaxhighlighter.h>
 
-namespace TextEditor { class FontSettings; }
-
 namespace Git {
 namespace Internal {
 
@@ -55,13 +53,10 @@ enum Format {
 class GitSubmitHighlighter : public TextEditor::SyntaxHighlighter
 {
 public:
-    explicit GitSubmitHighlighter(QTextEdit *parent);
-    explicit GitSubmitHighlighter(TextEditor::BaseTextDocument *parent);
+    explicit GitSubmitHighlighter(QTextEdit *parent = 0);
     void highlightBlock(const QString &text);
 
 private:
-    void initialize();
-
     enum State { None = -1, Header, Other };
     QRegExp m_keywordPattern;
     QChar m_hashChar;
@@ -72,7 +67,7 @@ private:
 class GitRebaseHighlighter : public TextEditor::SyntaxHighlighter
 {
 public:
-    explicit GitRebaseHighlighter(TextEditor::BaseTextDocument *parent);
+    explicit GitRebaseHighlighter(QTextDocument *parent = 0);
     void highlightBlock(const QString &text);
 
 private:
diff --git a/src/plugins/glsleditor/glsleditor.cpp b/src/plugins/glsleditor/glsleditor.cpp
index 58a3d461b05..48e2faec4a1 100644
--- a/src/plugins/glsleditor/glsleditor.cpp
+++ b/src/plugins/glsleditor/glsleditor.cpp
@@ -374,7 +374,7 @@ GlslEditorFactory::GlslEditorFactory()
     setEditorWidgetCreator([]() { return new GlslEditorWidget; });
     setEditorCreator([]() { return new GlslEditor; });
     setIndenterCreator([]() { return new GlslIndenter; });
-    setSyntaxHighlighterCreator([]() { return new Highlighter; });
+    setSyntaxHighlighterCreator([]() { return new GlslHighlighter; });
 
     setEditorActionHandlers(Constants::C_GLSLEDITOR_ID,
                             TextEditorActionHandler::Format
diff --git a/src/plugins/glsleditor/glsleditorplugin.cpp b/src/plugins/glsleditor/glsleditorplugin.cpp
index 6cc286f863a..3034bbaad0e 100644
--- a/src/plugins/glsleditor/glsleditorplugin.cpp
+++ b/src/plugins/glsleditor/glsleditorplugin.cpp
@@ -212,7 +212,7 @@ bool GlslEditorPlugin::initialize(const QStringList & /*arguments*/, QString *er
     addAutoReleasedObject(wizard);
 
     auto hf = new HighlighterFactory;
-    hf->setProductType<Highlighter>();
+    hf->setProductType<GlslHighlighter>();
     hf->setId(Constants::C_GLSLEDITOR_ID);
     hf->addMimeType(Constants::GLSL_MIMETYPE);
     hf->addMimeType(Constants::GLSL_MIMETYPE_VERT);
diff --git a/src/plugins/glsleditor/glslhighlighter.cpp b/src/plugins/glsleditor/glslhighlighter.cpp
index f8e01e92b3a..9ccc12a8367 100644
--- a/src/plugins/glsleditor/glslhighlighter.cpp
+++ b/src/plugins/glsleditor/glslhighlighter.cpp
@@ -35,23 +35,12 @@
 
 #include <QDebug>
 
-using namespace GlslEditor;
-using namespace GlslEditor::Internal;
 using namespace TextEditor;
 
-Highlighter::Highlighter(QTextDocument *parent)
-    : TextEditor::SyntaxHighlighter(parent)
-{
-    init();
-}
+namespace GlslEditor {
+namespace Internal {
 
-Highlighter::Highlighter(BaseTextDocument *parent)
-    : TextEditor::SyntaxHighlighter(parent)
-{
-    init();
-}
-
-void Highlighter::init()
+GlslHighlighter::GlslHighlighter()
 {
     static QVector<TextEditor::TextStyle> categories;
     if (categories.isEmpty()) {
@@ -71,12 +60,7 @@ void Highlighter::init()
     setTextFormatCategories(categories);
 }
 
-Highlighter::~Highlighter()
-{
-
-}
-
-void Highlighter::highlightBlock(const QString &text)
+void GlslHighlighter::highlightBlock(const QString &text)
 {
     const int previousState = previousBlockState();
     int state = 0, initialBraceDepth = 0;
@@ -265,7 +249,7 @@ void Highlighter::highlightBlock(const QString &text)
     setCurrentBlockState((braceDepth << 8) | lex.state());
 }
 
-void Highlighter::highlightLine(const QString &text, int position, int length,
+void GlslHighlighter::highlightLine(const QString &text, int position, int length,
                                 const QTextCharFormat &format)
 {
     const QTextCharFormat visualSpaceFormat = formatForCategory(GLSLVisualWhitespace);
@@ -288,7 +272,7 @@ void Highlighter::highlightLine(const QString &text, int position, int length,
     }
 }
 
-bool Highlighter::isPPKeyword(const QStringRef &text) const
+bool GlslHighlighter::isPPKeyword(const QStringRef &text) const
 {
     switch (text.length())
     {
@@ -427,3 +411,6 @@ void Highlighter::highlightBlock(const QString &text)
     setCurrentBlockState((braceDepth << 8) | lex.state());
 }
 #endif
+
+} // namespace Internal
+} // namespace GlslEditor
diff --git a/src/plugins/glsleditor/glslhighlighter.h b/src/plugins/glsleditor/glslhighlighter.h
index d979bc639f4..c294c797dcf 100644
--- a/src/plugins/glsleditor/glslhighlighter.h
+++ b/src/plugins/glsleditor/glslhighlighter.h
@@ -26,6 +26,7 @@
 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
 **
 ****************************************************************************/
+
 #ifndef GLSLHIGHLIGHTER_H
 #define GLSLHIGHLIGHTER_H
 
@@ -34,9 +35,7 @@
 namespace GlslEditor {
 namespace Internal {
 
-class GlslEditorWidget;
-
-class Highlighter : public TextEditor::SyntaxHighlighter
+class GlslHighlighter : public TextEditor::SyntaxHighlighter
 {
     Q_OBJECT
 
@@ -57,17 +56,12 @@ public:
         NumGLSLFormats
     };
 
-    explicit Highlighter(QTextDocument *parent = 0);
-    explicit Highlighter(TextEditor::BaseTextDocument *parent);
-    virtual ~Highlighter();
+    GlslHighlighter();
 
 protected:
     void highlightBlock(const QString &text);
     void highlightLine(const QString &text, int position, int length, const QTextCharFormat &format);
     bool isPPKeyword(const QStringRef &text) const;
-
-private:
-    void init();
 };
 
 } // namespace Internal
diff --git a/src/plugins/pythoneditor/tools/pythonhighlighter.cpp b/src/plugins/pythoneditor/tools/pythonhighlighter.cpp
index e69b95a163c..24df0857f03 100644
--- a/src/plugins/pythoneditor/tools/pythonhighlighter.cpp
+++ b/src/plugins/pythoneditor/tools/pythonhighlighter.cpp
@@ -44,8 +44,7 @@
 #include <texteditor/texteditorconstants.h>
 
 namespace PythonEditor {
-
-using namespace PythonEditor::Internal;
+namespace Internal {
 
 /**
  * @class PyEditor::Highlighter
@@ -65,20 +64,7 @@ using namespace PythonEditor::Internal;
  * @endcode
  */
 
-PythonHighlighter::PythonHighlighter(QTextDocument *parent) :
-    TextEditor::SyntaxHighlighter(parent)
-{
-    init();
-}
-
-/// New instance created when opening any document in editor
-PythonHighlighter::PythonHighlighter(TextEditor::BaseTextDocument *parent) :
-    TextEditor::SyntaxHighlighter(parent)
-{
-    init();
-}
-
-void PythonHighlighter::init()
+PythonHighlighter::PythonHighlighter()
 {
     static QVector<TextEditor::TextStyle> categories;
     if (categories.isEmpty()) {
@@ -98,11 +84,6 @@ void PythonHighlighter::init()
     setTextFormatCategories(categories);
 }
 
-/// Instance destroyed when one of documents closed from editor
-PythonHighlighter::~PythonHighlighter()
-{
-}
-
 /**
  * @brief Highlighter::highlightBlock highlights single line of Python code
  * @param text is single line without EOLN symbol. Access to all block data
@@ -123,11 +104,9 @@ void PythonHighlighter::highlightBlock(const QString &text)
 /**
  * @return True if this keyword is acceptable at start of import line
  */
-static inline
-bool isImportKeyword(const QString &keyword)
+static bool isImportKeyword(const QString &keyword)
 {
-    return (keyword == QLatin1String("import")
-            || keyword == QLatin1String("from"));
+    return keyword == QLatin1String("import") || keyword == QLatin1String("from");
 }
 
 /**
@@ -175,4 +154,5 @@ void PythonHighlighter::highlightImport(Scanner &scanner)
     }
 }
 
+} // namespace Internal
 } // namespace PythonEditor
diff --git a/src/plugins/pythoneditor/tools/pythonhighlighter.h b/src/plugins/pythoneditor/tools/pythonhighlighter.h
index 70846f38988..4bafa4ca006 100644
--- a/src/plugins/pythoneditor/tools/pythonhighlighter.h
+++ b/src/plugins/pythoneditor/tools/pythonhighlighter.h
@@ -33,26 +33,24 @@
 #include <texteditor/syntaxhighlighter.h>
 
 namespace PythonEditor {
+namespace Internal {
 
-namespace Internal { class Scanner; }
+class Scanner;
 
 class PythonHighlighter : public TextEditor::SyntaxHighlighter
 {
-    Q_OBJECT
 public:
-    explicit PythonHighlighter(QTextDocument *parent = 0);
-    explicit PythonHighlighter(TextEditor::BaseTextDocument *parent);
-    virtual ~PythonHighlighter();
+    PythonHighlighter();
 
 protected:
-    virtual void highlightBlock(const QString &text);
+    void highlightBlock(const QString &text);
 
 private:
     int highlightLine(const QString &text, int initialState);
     void highlightImport(Internal::Scanner &scanner);
-    void init();
 };
 
+} // namespace Internal
 } // namespace PythonEditor
 
 #endif // PYTHONHIGHLIGHTER_H
diff --git a/src/plugins/qmljseditor/qmljseditordocument.cpp b/src/plugins/qmljseditor/qmljseditordocument.cpp
index 85b9172652b..62396d426fe 100644
--- a/src/plugins/qmljseditor/qmljseditordocument.cpp
+++ b/src/plugins/qmljseditor/qmljseditordocument.cpp
@@ -538,7 +538,7 @@ QmlJSEditorDocument::QmlJSEditorDocument()
     setId(Constants::C_QMLJSEDITOR_ID);
     connect(this, SIGNAL(tabSettingsChanged()),
             d, SLOT(invalidateFormatterCache()));
-    setSyntaxHighlighter(new Highlighter(document()));
+    setSyntaxHighlighter(new QmlJSHighlighter(document()));
     setIndenter(new Internal::Indenter);
 }
 
diff --git a/src/plugins/qmljseditor/qmljseditorplugin.cpp b/src/plugins/qmljseditor/qmljseditorplugin.cpp
index 4651bfe584b..c2f4fc84a47 100644
--- a/src/plugins/qmljseditor/qmljseditorplugin.cpp
+++ b/src/plugins/qmljseditor/qmljseditorplugin.cpp
@@ -113,7 +113,7 @@ bool QmlJSEditorPlugin::initialize(const QStringList & /*arguments*/, QString *e
     addAutoReleasedObject(new QmlJSSnippetProvider);
 
     auto hf = new TextEditor::HighlighterFactory;
-    hf->setProductType<Highlighter>();
+    hf->setProductType<QmlJSHighlighter>();
     hf->setId(Constants::C_QMLJSEDITOR_ID);
     hf->addMimeType(QmlJSTools::Constants::QML_MIMETYPE);
     hf->addMimeType(QmlJSTools::Constants::QMLPROJECT_MIMETYPE);
diff --git a/src/plugins/qmljseditor/qmljshighlighter.cpp b/src/plugins/qmljseditor/qmljshighlighter.cpp
index 8ce15adae4b..b710b7dd393 100644
--- a/src/plugins/qmljseditor/qmljshighlighter.cpp
+++ b/src/plugins/qmljseditor/qmljshighlighter.cpp
@@ -33,11 +33,13 @@
 
 #include <utils/qtcassert.h>
 
-using namespace QmlJSEditor;
 using namespace QmlJS;
+using namespace TextEditor;
 
-Highlighter::Highlighter(QTextDocument *parent)
-    : TextEditor::SyntaxHighlighter(parent),
+namespace QmlJSEditor {
+
+QmlJSHighlighter::QmlJSHighlighter(QTextDocument *parent)
+    : SyntaxHighlighter(parent),
       m_qmlEnabled(true),
       m_braceDepth(0),
       m_foldingIndent(0),
@@ -57,21 +59,21 @@ Highlighter::Highlighter(QTextDocument *parent)
     setTextFormatCategories(categories);
 }
 
-Highlighter::~Highlighter()
+QmlJSHighlighter::~QmlJSHighlighter()
 {
 }
 
-bool Highlighter::isQmlEnabled() const
+bool QmlJSHighlighter::isQmlEnabled() const
 {
     return m_qmlEnabled;
 }
 
-void Highlighter::setQmlEnabled(bool qmlEnabled)
+void QmlJSHighlighter::setQmlEnabled(bool qmlEnabled)
 {
     m_qmlEnabled = qmlEnabled;
 }
 
-void Highlighter::highlightBlock(const QString &text)
+void QmlJSHighlighter::highlightBlock(const QString &text)
 {
     const QList<Token> tokens = m_scanner(text, onBlockStart());
 
@@ -200,7 +202,7 @@ void Highlighter::highlightBlock(const QString &text)
     onBlockEnd(m_scanner.state());
 }
 
-bool Highlighter::maybeQmlKeyword(const QStringRef &text) const
+bool QmlJSHighlighter::maybeQmlKeyword(const QStringRef &text) const
 {
     if (text.isEmpty())
         return false;
@@ -224,7 +226,7 @@ bool Highlighter::maybeQmlKeyword(const QStringRef &text) const
         return false;
 }
 
-bool Highlighter::maybeQmlBuiltinType(const QStringRef &text) const
+bool QmlJSHighlighter::maybeQmlBuiltinType(const QStringRef &text) const
 {
     if (text.isEmpty())
         return false;
@@ -281,13 +283,13 @@ bool Highlighter::maybeQmlBuiltinType(const QStringRef &text) const
         return false;
 }
 
-int Highlighter::onBlockStart()
+int QmlJSHighlighter::onBlockStart()
 {
     m_currentBlockParentheses.clear();
     m_braceDepth = 0;
     m_foldingIndent = 0;
     m_inMultilineComment = false;
-    if (TextEditor::TextBlockUserData *userData = TextEditor::BaseTextDocumentLayout::testUserData(currentBlock())) {
+    if (TextBlockUserData *userData = BaseTextDocumentLayout::testUserData(currentBlock())) {
         userData->setFoldingIndent(0);
         userData->setFoldingStartIncluded(false);
         userData->setFoldingEndIncluded(false);
@@ -305,34 +307,35 @@ int Highlighter::onBlockStart()
     return state;
 }
 
-void Highlighter::onBlockEnd(int state)
+void QmlJSHighlighter::onBlockEnd(int state)
 {
     setCurrentBlockState((m_braceDepth << 8) | state);
-    TextEditor::BaseTextDocumentLayout::setParentheses(currentBlock(), m_currentBlockParentheses);
-    TextEditor::BaseTextDocumentLayout::setFoldingIndent(currentBlock(), m_foldingIndent);
+    BaseTextDocumentLayout::setParentheses(currentBlock(), m_currentBlockParentheses);
+    BaseTextDocumentLayout::setFoldingIndent(currentBlock(), m_foldingIndent);
 }
 
-void Highlighter::onOpeningParenthesis(QChar parenthesis, int pos, bool atStart)
+void QmlJSHighlighter::onOpeningParenthesis(QChar parenthesis, int pos, bool atStart)
 {
     if (parenthesis == QLatin1Char('{') || parenthesis == QLatin1Char('[') || parenthesis == QLatin1Char('+')) {
         ++m_braceDepth;
         // if a folding block opens at the beginning of a line, treat the entire line
         // as if it were inside the folding block
         if (atStart)
-            TextEditor::BaseTextDocumentLayout::userData(currentBlock())->setFoldingStartIncluded(true);
+            BaseTextDocumentLayout::userData(currentBlock())->setFoldingStartIncluded(true);
     }
     m_currentBlockParentheses.push_back(Parenthesis(Parenthesis::Opened, parenthesis, pos));
 }
 
-void Highlighter::onClosingParenthesis(QChar parenthesis, int pos, bool atEnd)
+void QmlJSHighlighter::onClosingParenthesis(QChar parenthesis, int pos, bool atEnd)
 {
     if (parenthesis == QLatin1Char('}') || parenthesis == QLatin1Char(']') || parenthesis == QLatin1Char('-')) {
         --m_braceDepth;
         if (atEnd)
-            TextEditor::BaseTextDocumentLayout::userData(currentBlock())->setFoldingEndIncluded(true);
+            BaseTextDocumentLayout::userData(currentBlock())->setFoldingEndIncluded(true);
         else
             m_foldingIndent = qMin(m_braceDepth, m_foldingIndent); // folding indent is the minimum brace depth of a block
     }
     m_currentBlockParentheses.push_back(Parenthesis(Parenthesis::Closed, parenthesis, pos));
 }
 
+} // namespace QmlJSEditor
diff --git a/src/plugins/qmljseditor/qmljshighlighter.h b/src/plugins/qmljseditor/qmljshighlighter.h
index 29412eedeac..8979ce34b51 100644
--- a/src/plugins/qmljseditor/qmljshighlighter.h
+++ b/src/plugins/qmljseditor/qmljshighlighter.h
@@ -39,13 +39,13 @@
 
 namespace QmlJSEditor {
 
-class QMLJSEDITOR_EXPORT Highlighter : public TextEditor::SyntaxHighlighter
+class QMLJSEDITOR_EXPORT QmlJSHighlighter : public TextEditor::SyntaxHighlighter
 {
     Q_OBJECT
 
 public:
-    Highlighter(QTextDocument *parent = 0);
-    virtual ~Highlighter();
+    QmlJSHighlighter(QTextDocument *parent = 0);
+    virtual ~QmlJSHighlighter();
 
     enum {
         NumberFormat,
@@ -76,16 +76,13 @@ protected:
     bool maybeQmlBuiltinType(const QStringRef &text) const;
 
 private:
-    typedef TextEditor::Parenthesis Parenthesis;
-    typedef TextEditor::Parentheses Parentheses;
-
     bool m_qmlEnabled;
     int m_braceDepth;
     int m_foldingIndent;
     bool m_inMultilineComment;
 
     QmlJS::Scanner m_scanner;
-    Parentheses m_currentBlockParentheses;
+    TextEditor::Parentheses m_currentBlockParentheses;
 };
 
 } // namespace QmlJSEditor
diff --git a/src/plugins/qmljseditor/qmljssnippetprovider.cpp b/src/plugins/qmljseditor/qmljssnippetprovider.cpp
index c7e8b0cca62..84bd6545980 100644
--- a/src/plugins/qmljseditor/qmljssnippetprovider.cpp
+++ b/src/plugins/qmljseditor/qmljssnippetprovider.cpp
@@ -64,7 +64,7 @@ QString QmlJSSnippetProvider::displayName() const
 
 void QmlJSSnippetProvider::decorateEditor(TextEditor::SnippetEditorWidget *editor) const
 {
-    editor->textDocument()->setSyntaxHighlighter(new Highlighter);
+    editor->textDocument()->setSyntaxHighlighter(new QmlJSHighlighter);
     editor->textDocument()->setIndenter(new Indenter);
     editor->setAutoCompleter(new AutoCompleter);
 }
diff --git a/src/plugins/texteditor/syntaxhighlighter.cpp b/src/plugins/texteditor/syntaxhighlighter.cpp
index bd99b752bc4..39b4d1812e8 100644
--- a/src/plugins/texteditor/syntaxhighlighter.cpp
+++ b/src/plugins/texteditor/syntaxhighlighter.cpp
@@ -282,13 +282,6 @@ SyntaxHighlighter::SyntaxHighlighter(QTextDocument *parent)
     setDocument(parent);
 }
 
-SyntaxHighlighter::SyntaxHighlighter(BaseTextDocument *parent)
-    : d_ptr(new SyntaxHighlighterPrivate)
-{
-    d_ptr->q_ptr = this;
-    parent->setSyntaxHighlighter(this); // Extra logic (including setting the parent).
-}
-
 /*!
     Constructs a SyntaxHighlighter and installs it on \a parent's
     QTextDocument. The specified QTextEdit also becomes the owner of
diff --git a/src/plugins/texteditor/syntaxhighlighter.h b/src/plugins/texteditor/syntaxhighlighter.h
index 4f7292d13ec..094930782b3 100644
--- a/src/plugins/texteditor/syntaxhighlighter.h
+++ b/src/plugins/texteditor/syntaxhighlighter.h
@@ -47,7 +47,6 @@ QT_END_NAMESPACE
 
 namespace TextEditor {
 
-class BaseTextDocument;
 class FontSettings;
 class SyntaxHighlighterPrivate;
 
@@ -56,9 +55,8 @@ class TEXTEDITOR_EXPORT SyntaxHighlighter : public QObject
     Q_OBJECT
     Q_DECLARE_PRIVATE(SyntaxHighlighter)
 public:
-    SyntaxHighlighter(QObject *parent);
+    SyntaxHighlighter(QObject *parent = 0);
     SyntaxHighlighter(QTextDocument *parent);
-    SyntaxHighlighter(BaseTextDocument *parent);
     SyntaxHighlighter(QTextEdit *parent);
     virtual ~SyntaxHighlighter();
 
diff --git a/tests/auto/generichighlighter/highlighterengine/highlightermock.h b/tests/auto/generichighlighter/highlighterengine/highlightermock.h
index d8c2ec8a64b..e9bbb694594 100644
--- a/tests/auto/generichighlighter/highlighterengine/highlightermock.h
+++ b/tests/auto/generichighlighter/highlighterengine/highlightermock.h
@@ -34,13 +34,6 @@
 
 #include <QList>
 
-namespace TextEditor {
-namespace Internal {
-class Context;
-class HighlightDefinition;
-}
-}
-
 struct HighlightSequence
 {
     HighlightSequence() {}