diff --git a/include/polarssl/gcm.h b/include/polarssl/gcm.h
index 279e84b..e4267c6 100644
--- a/include/polarssl/gcm.h
+++ b/include/polarssl/gcm.h
@@ -29,7 +29,7 @@
 
 #include "cipher.h"
 
-#ifdef _MSC_VER
+#if defined(_MSC_VER) && !defined(EFIX64) && !defined(EFI32)
 #include <basetsd.h>
 typedef UINT32 uint32_t;
 typedef UINT64 uint64_t;