diff --git a/reactos/drivers/base/kdvm/kdvbox_asm.S b/reactos/drivers/base/kdvm/kdvbox_asm.S
index 5adda24f5f3..78c7748edfb 100644
--- a/reactos/drivers/base/kdvm/kdvbox_asm.S
+++ b/reactos/drivers/base/kdvm/kdvbox_asm.S
@@ -14,6 +14,7 @@ ENDFUNC
 #else
 PUBLIC KdVmExchange
 FUNC KdVmExchange
+    .endprolog
     xchg rax, rcx
     mov edx, HEX(5659)
     out dx, rax