diff --git a/src/plugins/texteditor/codecselector.cpp b/src/plugins/texteditor/codecselector.cpp
index 0e90d3e00fb..1fe3a25da16 100644
--- a/src/plugins/texteditor/codecselector.cpp
+++ b/src/plugins/texteditor/codecselector.cpp
@@ -58,7 +58,7 @@ public:
 } // namespace TextEditor
 
 
-CodecSelector::CodecSelector(QWidget *parent, TextDocument *doc)
+CodecSelector::CodecSelector(QWidget *parent, Core::BaseTextDocument *doc)
     : QDialog(parent)
 {
     m_hasDecodingError = doc->hasDecodingError();
diff --git a/src/plugins/texteditor/codecselector.h b/src/plugins/texteditor/codecselector.h
index 64081ca3490..eda3b91819f 100644
--- a/src/plugins/texteditor/codecselector.h
+++ b/src/plugins/texteditor/codecselector.h
@@ -31,11 +31,9 @@
 #include <QListWidget>
 
 namespace Utils { class ListWidget; }
+namespace Core { class BaseTextDocument; }
 
 namespace TextEditor {
-
-class TextDocument;
-
 namespace Internal {
 
 class CodecSelector : public QDialog
@@ -44,7 +42,7 @@ class CodecSelector : public QDialog
 
 public:
 
-    CodecSelector(QWidget *parent, TextDocument *doc);
+    CodecSelector(QWidget *parent, Core::BaseTextDocument *doc);
     ~CodecSelector() override;
 
     QTextCodec *selectedCodec() const;