diff --git a/libs/gtkmm2ext/grouped_buttons.cc b/libs/gtkmm2ext/grouped_buttons.cc
index b16b983d02..cd45840a04 100644
--- a/libs/gtkmm2ext/grouped_buttons.cc
+++ b/libs/gtkmm2ext/grouped_buttons.cc
@@ -91,6 +91,6 @@ GroupedButtons::one_clicked (uint32_t which)
 		   it as inactive causes a segfault ...
 		*/
 
-		gtk_idle_add (reactivate_button, buttons[which]);
+		g_idle_add (reactivate_button, buttons[which]);
 	}
 }
diff --git a/libs/gtkmm2ext/popup.cc b/libs/gtkmm2ext/popup.cc
index 2a7d7057d8..6f4a8a5427 100644
--- a/libs/gtkmm2ext/popup.cc
+++ b/libs/gtkmm2ext/popup.cc
@@ -80,7 +80,7 @@ PopUp::remove ()
 
 	if (delete_on_hide) {
 		std::cerr << "deleting prompter\n";
-		gtk_idle_add (idle_delete, this);
+		g_idle_add (idle_delete, this);
 	}
 }
 #define ENSURE_GUI_THREAD(slot) \