diff --git a/Nt32Pkg/Include/Common/WinNTInclude.h b/Nt32Pkg/Include/Common/WinNTInclude.h
index 035f18f613..77a9e718d9 100644
--- a/Nt32Pkg/Include/Common/WinNTInclude.h
+++ b/Nt32Pkg/Include/Common/WinNTInclude.h
@@ -56,6 +56,7 @@ typedef UINT32 size_t ;
 #undef InterlockedDecrement
 #undef InterlockedCompareExchange64
 #undef InterlockedCompareExchangePointer
+#undef CreateEventEx
 
 #define VOID void