diff --git a/include/polarssl/pbkdf2.h b/include/polarssl/pbkdf2.h
index e2e61b5..5ccb2fa 100644
--- a/include/polarssl/pbkdf2.h
+++ b/include/polarssl/pbkdf2.h
@@ -34,7 +34,7 @@
 
 #include "md.h"
 
-#ifdef _MSC_VER
+#if defined(_MSC_VER) && !defined(EFIX64) && !defined(EFI32)
 #include <basetsd.h>
 typedef UINT32 uint32_t;
 #else