diff --git a/src/plugins/texteditor/texteditor.cpp b/src/plugins/texteditor/texteditor.cpp
index d08d79e14a7..6bf9960f798 100644
--- a/src/plugins/texteditor/texteditor.cpp
+++ b/src/plugins/texteditor/texteditor.cpp
@@ -8281,9 +8281,13 @@ IEditor *BaseTextEditor::duplicate()
 
 } // namespace TextEditor
 
+QT_BEGIN_NAMESPACE
+
 uint qHash(const QColor &color)
 {
     return color.rgba();
 }
 
+QT_END_NAMESPACE
+
 #include "texteditor.moc"
diff --git a/src/plugins/texteditor/texteditor.h b/src/plugins/texteditor/texteditor.h
index 1613de4ed02..0c2e83e1e87 100644
--- a/src/plugins/texteditor/texteditor.h
+++ b/src/plugins/texteditor/texteditor.h
@@ -672,6 +672,10 @@ private:
 
 } // namespace TextEditor
 
+QT_BEGIN_NAMESPACE
+
 uint qHash(const QColor &color);
 
+QT_END_NAMESPACE
+
 Q_DECLARE_METATYPE(TextEditor::TextEditorWidget::Link)