diff --git a/src/core/window-private.h b/src/core/window-private.h
index 9571456ec..aa47d09fc 100644
--- a/src/core/window-private.h
+++ b/src/core/window-private.h
@@ -518,7 +518,6 @@ MetaWindow * _meta_window_shared_new       (MetaDisplay         *display,
 
 void        meta_window_unmanage           (MetaWindow  *window,
                                             guint32      timestamp);
-void        meta_window_calc_showing       (MetaWindow  *window);
 void        meta_window_queue              (MetaWindow  *window,
                                             guint queuebits);
 void        meta_window_tile               (MetaWindow        *window);
diff --git a/src/core/window.c b/src/core/window.c
index b2d277f0e..351b74ada 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -1543,7 +1543,7 @@ implement_showing (MetaWindow *window,
     meta_window_show (window);
 }
 
-void
+static void
 meta_window_calc_showing (MetaWindow  *window)
 {
   implement_showing (window, meta_window_should_be_showing (window));