diff --git a/src/plugins/texteditor/basetextdocument.cpp b/src/plugins/texteditor/basetextdocument.cpp
index 7c5b5991384..df0e64a956d 100644
--- a/src/plugins/texteditor/basetextdocument.cpp
+++ b/src/plugins/texteditor/basetextdocument.cpp
@@ -228,6 +228,7 @@ public:
 
     bool m_fileIsReadOnly;
     bool m_hasDecodingError;
+    bool m_hasHighlightWarning;
     QByteArray m_decodingErrorSample;
     static const int kChunkSize;
 
@@ -245,6 +246,7 @@ BaseTextDocumentPrivate::BaseTextDocumentPrivate(BaseTextDocument *q) :
     m_fileHasUtf8Bom(false),
     m_fileIsReadOnly(false),
     m_hasDecodingError(false),
+    m_hasHighlightWarning(false),
     m_autoSaveRevision(-1)
 {
 }
@@ -716,6 +718,16 @@ void BaseTextDocument::documentClosing()
     }
 }
 
+bool BaseTextDocument::hasHighlightWarning() const
+{
+    return d->m_hasHighlightWarning;
+}
+
+void BaseTextDocument::setHighlightWarning(bool has)
+{
+    d->m_hasHighlightWarning = has;
+}
+
 } // namespace TextEditor
 
 #include "basetextdocument.moc"
diff --git a/src/plugins/texteditor/basetextdocument.h b/src/plugins/texteditor/basetextdocument.h
index 481baae76cc..22d6e92fffe 100644
--- a/src/plugins/texteditor/basetextdocument.h
+++ b/src/plugins/texteditor/basetextdocument.h
@@ -103,6 +103,9 @@ public:
     bool reload(QString *errorString, QTextCodec *codec);
     void cleanWhitespace(const QTextCursor &cursor);
 
+    bool hasHighlightWarning() const;
+    void setHighlightWarning(bool has);
+
 signals:
     void titleChanged(QString title);
 
diff --git a/src/plugins/texteditor/plaintexteditorfactory.cpp b/src/plugins/texteditor/plaintexteditorfactory.cpp
index accf655425f..9ee3160bd0c 100644
--- a/src/plugins/texteditor/plaintexteditorfactory.cpp
+++ b/src/plugins/texteditor/plaintexteditorfactory.cpp
@@ -32,6 +32,7 @@
 
 #include "plaintexteditor.h"
 #include "plaintexteditorfactory.h"
+#include "basetextdocument.h"
 #include "texteditorconstants.h"
 #include "texteditorplugin.h"
 #include "texteditoractionhandler.h"
@@ -94,20 +95,29 @@ void PlainTextEditorFactory::updateEditorInfoBar(Core::IEditor *editor)
 {
     PlainTextEditor *editorEditable = qobject_cast<PlainTextEditor *>(editor);
     if (editorEditable) {
+        BaseTextDocument *file = qobject_cast<BaseTextDocument *>(editor->file());
+        if (!file)
+            return;
         PlainTextEditorWidget *textEditor = static_cast<PlainTextEditorWidget *>(editorEditable->editorWidget());
         if (textEditor->isMissingSyntaxDefinition() &&
             !textEditor->ignoreMissingSyntaxDefinition() &&
             TextEditorSettings::instance()->highlighterSettings().alertWhenNoDefinition()) {
+            if (file->hasHighlightWarning())
+                return;
             Core::InfoBarEntry info(Constants::INFO_SYNTAX_DEFINITION,
                                     tr("A highlight definition was not found for this file. "
                                        "Would you like to try to find one?"));
             info.setCustomButtonInfo(tr("Show highlighter options"),
                                      textEditor, SLOT(acceptMissingSyntaxDefinitionInfo()));
             info.setCancelButtonInfo(textEditor, SLOT(ignoreMissingSyntaxDefinitionInfo()));
-            editor->file()->infoBar()->addInfo(info);
+            file->infoBar()->addInfo(info);
+            file->setHighlightWarning(true);
             return;
         }
-        editor->file()->infoBar()->removeInfo(Constants::INFO_SYNTAX_DEFINITION);
+        if (!file->hasHighlightWarning())
+            return;
+        file->infoBar()->removeInfo(Constants::INFO_SYNTAX_DEFINITION);
+        file->setHighlightWarning(false);
     }
 }