--- a/libgui/src/m-editor/file-editor-tab.h
+++ b/libgui/src/m-editor/file-editor-tab.h
@@ -64,26 +64,25 @@
 
   void set_modified (bool modified = true);
 
-  bool open_file (QString dir = QString ());
-  void load_file (QString fileName);
+  bool open_file (const QString& dir = QString ());
+  void load_file (const QString& fileName);
   void new_file ();
   bool save_file ();
-  bool save_file(QString saveFileName);
+  bool save_file (const QString& saveFileName);
   bool save_file_as();
   void run_file ();
 
-  void file_has_changed (QString fileName);
-  
+  void file_has_changed (const QString& fileName);
   QString get_file_name () const {return _file_name;} 
 
 signals:
-  void file_name_changed (QString fileName);
+  void file_name_changed (const QString& fileName);
   void editor_state_changed ();
   void close_request ();
 
 protected:
   void closeEvent (QCloseEvent *event);
-  void set_file_name (QString fileName);
+  void set_file_name (const QString& fileName);
 
 private:
   void update_lexer ();
@@ -91,7 +90,7 @@
   void request_remove_breakpoint (int line);
 
   void update_tracked_file ();
-  int check_file_modified (QString msg, int cancelButton);
+  int check_file_modified (const QString& msg, int cancelButton);
   void do_comment_selected_text (bool comment);
 
   file_editor *         _file_editor;