diff --git a/kernel/trunk/gui/button.inc b/kernel/trunk/gui/button.inc
index 63f3b797e5..e042a3a02b 100644
--- a/kernel/trunk/gui/button.inc
+++ b/kernel/trunk/gui/button.inc
@@ -248,11 +248,13 @@ syscall_button.remove_button:
         jne     .next_button
 
         ; okay, undefine it
+        push    ebx
         mov     ebx, esi
         lea     eax, [esi + SYS_BUTTON.sizeof]
         call    memmove
         dec     dword[edi]
         add     ecx, -SYS_BUTTON.sizeof
+        pop     ebx
         jmp     .next_button
 
   .exit: