diff --git a/src/frontends/qt4/CustomizedWidgets.cpp b/src/frontends/qt4/CustomizedWidgets.cpp
index dd87c84cb0..b6dc73faf3 100644
--- a/src/frontends/qt4/CustomizedWidgets.cpp
+++ b/src/frontends/qt4/CustomizedWidgets.cpp
@@ -86,7 +86,7 @@ KeySequence const ShortcutWidget::getKeySequence() const
 }
 
 
-void ShortcutWidget::setKeySequence(lyx::KeySequence const s)
+void ShortcutWidget::setKeySequence(lyx::KeySequence const & s)
 {
 	keysequence_ = s;
 }
diff --git a/src/frontends/qt4/CustomizedWidgets.h b/src/frontends/qt4/CustomizedWidgets.h
index 0741a64e8a..6104d30d8b 100644
--- a/src/frontends/qt4/CustomizedWidgets.h
+++ b/src/frontends/qt4/CustomizedWidgets.h
@@ -33,7 +33,7 @@ public:
 	void reset();
 	bool eventFilter(QObject*, QEvent* e );
 	KeySequence const getKeySequence() const;
-	void setKeySequence(lyx::KeySequence const s);
+	void setKeySequence(lyx::KeySequence const & s);
 	void removeFromSequence();
 protected Q_SLOTS:
 	bool event(QEvent* e);