diff --git a/OvmfPkg/TdxDxe/X64/ApRunLoop.nasm b/OvmfPkg/TdxDxe/X64/ApRunLoop.nasm
index 49bd04415c..a859375fb8 100644
--- a/OvmfPkg/TdxDxe/X64/ApRunLoop.nasm
+++ b/OvmfPkg/TdxDxe/X64/ApRunLoop.nasm
@@ -69,7 +69,7 @@ MailBoxWakeUp:
     mov        rax, [rbx + WakeupVectorOffset]
     ; OS sends a wakeup command for a given APIC ID, firmware is supposed to reset
     ; the command field back to zero as acknowledgement.
-    mov        qword [rbx + WakeupVectorOffset], 0
+    mov        qword [rbx + CommandOffset], 0
     jmp        rax
 MailBoxSleep:
     jmp       $