diff --git a/clutter/x11/clutter-x11.h b/clutter/x11/clutter-x11.h
index 368a117b0..66bea5863 100644
--- a/clutter/x11/clutter-x11.h
+++ b/clutter/x11/clutter-x11.h
@@ -128,7 +128,7 @@ gboolean clutter_x11_has_xinput (void);
 
 gboolean clutter_x11_has_composite_extension (void);
 
-void     clutter_X11_set_use_argb_visual (gboolean use_argb);
+void     clutter_x11_set_use_argb_visual (gboolean use_argb);
 gboolean clutter_x11_get_use_argb_visual (void);
 
 Time clutter_x11_get_current_event_time (void);