diff --git a/src/core/display-private.h b/src/core/display-private.h
index f13736317..759093b48 100644
--- a/src/core/display-private.h
+++ b/src/core/display-private.h
@@ -484,8 +484,8 @@ void meta_display_cancel_touch (MetaDisplay *display);
 
 gboolean meta_display_windows_are_interactable (MetaDisplay *display);
 
-gboolean meta_display_set_alarm_filter (MetaDisplay    *display,
-                                        MetaAlarmFilter filter,
-                                        gpointer        data);
+ovid meta_display_set_alarm_filter (MetaDisplay    *display,
+                                    MetaAlarmFilter filter,
+                                    gpointer        data);
 
 #endif
diff --git a/src/core/display.c b/src/core/display.c
index 11cab2daa..79720edf6 100644
--- a/src/core/display.c
+++ b/src/core/display.c
@@ -3019,7 +3019,7 @@ meta_display_is_pointer_emulating_sequence (MetaDisplay          *display,
   return display->pointer_emulating_sequence == sequence;
 }
 
-gboolean
+void
 meta_display_set_alarm_filter (MetaDisplay    *display,
                                MetaAlarmFilter filter,
                                gpointer        data)