diff --git a/glib/deprecated/gthread-deprecated.c b/glib/deprecated/gthread-deprecated.c
index 209d77661..ab8dd907d 100644
--- a/glib/deprecated/gthread-deprecated.c
+++ b/glib/deprecated/gthread-deprecated.c
@@ -1221,7 +1221,7 @@ struct _GStaticPrivateNode
   GStaticPrivate *owner;
 };
 
-void
+static void
 g_static_private_cleanup (gpointer data)
 {
   GArray *array = data;