diff --git a/drivers/mouse/ps2mouse4d/trunk/ps2m_irqh.inc b/drivers/mouse/ps2mouse4d/trunk/ps2m_irqh.inc
index 28d738662c..4531956512 100644
--- a/drivers/mouse/ps2mouse4d/trunk/ps2m_irqh.inc
+++ b/drivers/mouse/ps2mouse4d/trunk/ps2m_irqh.inc
@@ -113,6 +113,8 @@ proc irq_handler
         mov   [mouse_byte],0
 
   .exit:
+        xor     eax, eax
+        inc     eax
         ret
 endp