diff --git a/src/plugins/texteditor/basetextdocumentlayout.cpp b/src/plugins/texteditor/basetextdocumentlayout.cpp
index 0b9f69397ad..0166d19a4fe 100644
--- a/src/plugins/texteditor/basetextdocumentlayout.cpp
+++ b/src/plugins/texteditor/basetextdocumentlayout.cpp
@@ -35,6 +35,7 @@
 
 using namespace TextEditor;
 
+namespace TextEditor {
 namespace Internal {
 
 class DocumentMarker : public ITextMarkable
@@ -147,6 +148,7 @@ void DocumentMarker::updateMark(ITextMark *mark)
 }
 
 } // namespace Internal
+} // namespace TextEditor
 
 CodeFormatterData::~CodeFormatterData()
 {