diff --git a/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm b/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm
index 6a8794d..138b973 100644
--- a/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm
+++ b/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm
@@ -134,7 +134,7 @@
     cmp        rax, NotVacantFlag
     jz         TestLock
 
-    lea        ecx, [esi + InitFlagLocation]
+    lea        ecx, [esi + NumApsExecutingLocation]
     inc        dword [ecx]
     mov        ebx, [ecx]