diff --git a/kernel/trunk/gui/window.inc b/kernel/trunk/gui/window.inc
index c699407ba5..d6312fb9bd 100644
--- a/kernel/trunk/gui/window.inc
+++ b/kernel/trunk/gui/window.inc
@@ -141,6 +141,10 @@ dd  .setSkinUnicode
         cmp     edx, 192
         jnae    @f
         mov     edx, 192 ; max size
+@@:
+        stdcall is_region_userspace, edi, edx
+        jnz     @f
+        ret
 @@:
         mov     esi, common_colours
         mov     ecx, edx