diff --git a/kernel/trunk/gui/window.inc b/kernel/trunk/gui/window.inc
index ca5710b058..0cff7fa1d2 100644
--- a/kernel/trunk/gui/window.inc
+++ b/kernel/trunk/gui/window.inc
@@ -177,7 +177,6 @@ syscall_display_settings.02:
         jnae    @f
         mov     edx, 192 ; max size
       @@:
-        and     edx, 255
         mov     edi, common_colours
         mov     ecx, edx
         rep movsb
@@ -191,7 +190,6 @@ syscall_display_settings.03:
         jnae    @f
         mov     edx, 192 ; max size
       @@:
-        and     edx, 255
         mov     esi, common_colours
         mov     ecx, edx
         rep movsb