diff --git a/drivers/base/kdvm/kdvbox_asm.S b/drivers/base/kdvm/kdvbox_asm.S
index 78c7748edfb..7a247eecbeb 100644
--- a/drivers/base/kdvm/kdvbox_asm.S
+++ b/drivers/base/kdvm/kdvbox_asm.S
@@ -17,7 +17,7 @@ FUNC KdVmExchange
     .endprolog
     xchg rax, rcx
     mov edx, HEX(5659)
-    out dx, rax
+    out dx, eax
     ret
 ENDFUNC
 #endif