diff --git a/reactos/ntoskrnl/ke/amd64/boot.S b/reactos/ntoskrnl/ke/amd64/boot.S
index 82e0b054b4c..d3064c92b3d 100644
--- a/reactos/ntoskrnl/ke/amd64/boot.S
+++ b/reactos/ntoskrnl/ke/amd64/boot.S
@@ -76,7 +76,7 @@ _KiSetupStackAndInitializeKernel:
     /* Force interrupts enabled and lower IRQL back to DISPATCH_LEVEL */
     sti
     mov rcx, DISPATCH_LEVEL
-    call _KfLowerIrql
+    mov cr8, rcx
 
     /* Set the right wait IRQL */
     mov byte ptr [rbx+KTHREAD_WAIT_IRQL], DISPATCH_LEVEL;