diff --git a/src/frontends/qt4/QPrefsDialog.C b/src/frontends/qt4/QPrefsDialog.C
index 89ba000ed1..9c51634b78 100644
--- a/src/frontends/qt4/QPrefsDialog.C
+++ b/src/frontends/qt4/QPrefsDialog.C
@@ -184,7 +184,7 @@ PrefAscii::PrefAscii(QWidget * parent)
 {
 	setupUi(this);
 	connect(asciiLinelengthSB, SIGNAL(valueChanged(int)),
-		this, SIGNAL(changed));
+		this, SIGNAL(changed()));
 	connect(asciiRoffED, SIGNAL(textChanged(const QString&)),
 		this, SIGNAL(changed()));
 }
@@ -283,7 +283,7 @@ QString PrefKeyboard::testKeymap(QString keymap)
 }
 
 
-void PrefKeyboard::on_firstKeymapED_clicked()
+void PrefKeyboard::on_firstKeymapPB_clicked(bool)
 {
 	QString file = testKeymap(firstKeymapED->text());
 	if (!file.isEmpty())
@@ -291,7 +291,7 @@ void PrefKeyboard::on_firstKeymapED_clicked()
 }
 
 
-void PrefKeyboard::on_secondKeymapED_clicked()
+void PrefKeyboard::on_secondKeymapPB_clicked(bool)
 {
 	QString file = testKeymap(secondKeymapED->text());
 	if (!file.isEmpty())
diff --git a/src/frontends/qt4/QPrefsDialog.h b/src/frontends/qt4/QPrefsDialog.h
index 53cbb29274..f4958f82c5 100644
--- a/src/frontends/qt4/QPrefsDialog.h
+++ b/src/frontends/qt4/QPrefsDialog.h
@@ -122,8 +122,8 @@ public:
 	virtual void update(LyXRC const & rc);
 
 private slots:
-	void on_firstKeymapED_clicked();
-	void on_secondKeymapED_clicked();
+	void on_firstKeymapPB_clicked(bool);
+	void on_secondKeymapPB_clicked(bool);
 
 private:
 	QString testKeymap(QString keymap);