diff --git a/MdePkg/Library/BaseLib/Ia32/FlushCacheLine.asm b/MdePkg/Library/BaseLib/Ia32/FlushCacheLine.asm
index d79f217610..c1e6466d04 100644
--- a/MdePkg/Library/BaseLib/Ia32/FlushCacheLine.asm
+++ b/MdePkg/Library/BaseLib/Ia32/FlushCacheLine.asm
@@ -27,7 +27,7 @@
     .code
 
 ;------------------------------------------------------------------------------
-; VOID
+; VOID *
 ; EFIAPI
 ; AsmFlushCacheLine (
 ;   IN      VOID                      *LinearAddress
diff --git a/MdePkg/Library/BaseLib/X64/FlushCacheLine.asm b/MdePkg/Library/BaseLib/X64/FlushCacheLine.asm
index 1d470e8753..9978e734aa 100644
--- a/MdePkg/Library/BaseLib/X64/FlushCacheLine.asm
+++ b/MdePkg/Library/BaseLib/X64/FlushCacheLine.asm
@@ -24,7 +24,7 @@
     .code
 
 ;------------------------------------------------------------------------------
-; VOID
+; VOID *
 ; EFIAPI
 ; AsmFlushCacheLine (
 ;   IN      VOID                      *LinearAddress
@@ -32,6 +32,7 @@
 ;------------------------------------------------------------------------------
 AsmFlushCacheLine   PROC
     clflush [rcx]
+    mov     rax, rcx
     ret
 AsmFlushCacheLine   ENDP