diff --git a/src/core/window.c b/src/core/window.c
index 400403a59..c515df8a2 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -2308,7 +2308,7 @@ window_would_be_covered (const MetaWindow *newbie)
 }
 
 /* XXX META_EFFECT_*_MAP */
-void
+static void
 meta_window_show (MetaWindow *window)
 {
   gboolean did_show;