diff --git a/reactos/hal/halx86/generic/irq.S b/reactos/hal/halx86/generic/irq.S
index 9a00a96008c..15598822fef 100644
--- a/reactos/hal/halx86/generic/irq.S
+++ b/reactos/hal/halx86/generic/irq.S
@@ -254,6 +254,7 @@ _HalEnableSystemInterrupt@12:
     in al, dx
     mov dx, 1
     shl dx, cl
+    and dx, 0xDEF8
 
     /* Check if this is a latched interrupt */
     cmp dword ptr [esp+12], 0