diff --git a/stepmania/src/crypto/CryptNoise.cpp b/stepmania/src/crypto/CryptNoise.cpp
index f689e91905..da9a135540 100644
--- a/stepmania/src/crypto/CryptNoise.cpp
+++ b/stepmania/src/crypto/CryptNoise.cpp
@@ -6,6 +6,7 @@
 #include "global.h"
 
 #if defined(WIN32)
+#define _WIN32_WINNT 0x0400		// VC6 header needs this defined.  
 #include <wincrypt.h>
 
 /*