diff --git a/MdePkg/Library/BaseLib/X64/CpuId.asm b/MdePkg/Library/BaseLib/X64/CpuId.asm
index b5ac0fd2fc..5e7ee19c53 100644
--- a/MdePkg/Library/BaseLib/X64/CpuId.asm
+++ b/MdePkg/Library/BaseLib/X64/CpuId.asm
@@ -36,8 +36,8 @@
 ;------------------------------------------------------------------------------
 AsmCpuid    PROC    USES    rbx
     mov     eax, ecx
-    push    rdx
     push    rax                         ; save Index on stack
+    push    rdx
     cpuid
     test    r9, r9
     jz      @F