diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index 9a788d0dee..6e4106a3c8 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -4986,7 +4986,7 @@ void
 check_crossing_invariants (GtkWidget *widget,
                            GtkCrossingData *crossing)
 {
-#ifdef G_ENBABLE_DEBUG
+#ifdef G_ENABLE_DEBUG
   if (crossing->old_target == NULL)
     g_assert (crossing->old_descendent == NULL);
   else if (crossing->old_descendent == NULL)