diff --git a/modules/engines/ms-windows/xp_theme.c b/modules/engines/ms-windows/xp_theme.c
index 378e359726..0c64b4daa7 100755
--- a/modules/engines/ms-windows/xp_theme.c
+++ b/modules/engines/ms-windows/xp_theme.c
@@ -161,7 +161,8 @@ void
 xp_theme_reset (void)
 {
   xp_theme_close_open_handles ();
-  was_theming_active = (*is_theme_active_func) ();
+  was_theming_active = is_theme_active_func
+    ? (*is_theme_active_func) () : FALSE;
 }
 
 void