diff --git a/gtk/gtkcombobox.c b/gtk/gtkcombobox.c
index f007d841f9..c29896319e 100644
--- a/gtk/gtkcombobox.c
+++ b/gtk/gtkcombobox.c
@@ -2304,7 +2304,7 @@ gtk_combo_box_mnemonic_activate (GtkWidget *widget,
         gtk_widget_grab_focus (priv->child);
     }
   else
-    gtk_widget_grab_focus (priv->button);
+    gtk_widget_mnemonic_activate (priv->button, group_cycling);
 
   return TRUE;
 }