diff --git a/libs/gtkmm2ext/popup.cc b/libs/gtkmm2ext/popup.cc
index 6f4a8a5427..85a9d537c3 100644
--- a/libs/gtkmm2ext/popup.cc
+++ b/libs/gtkmm2ext/popup.cc
@@ -111,7 +111,7 @@ PopUp::touch ()
 }
 
 gint
-PopUp::button_click (GdkEventButton */*ev*/)
+PopUp::button_click (GdkEventButton* /*ev*/)
 {
 	remove ();
 	return TRUE;