diff --git a/MdePkg/Include/Protocol/Ip6.h b/MdePkg/Include/Protocol/Ip6.h
index 5acedfb6eb..1be6673d87 100644
--- a/MdePkg/Include/Protocol/Ip6.h
+++ b/MdePkg/Include/Protocol/Ip6.h
@@ -371,7 +371,7 @@ typedef struct _EFI_IP6_HEADER {
   EFI_IPv6_ADDRESS        SourceAddress;
   EFI_IPv6_ADDRESS        DestinationAddress;
 } EFI_IP6_HEADER;
-#pragma pack
+#pragma pack()
 
 ///
 /// EFI_IP6_FRAGMENT_DATA