diff --git a/src/core/window.c b/src/core/window.c
index 585adc2fd..67ea8d47e 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -2377,7 +2377,7 @@ unmap_client_window (MetaWindow *window,
 }
 
 /* XXX META_EFFECT_*_MAP */
-void
+static void
 meta_window_show (MetaWindow *window)
 {
   gboolean did_show;