diff --git a/src/libmodplug/stdafx.h b/src/libmodplug/stdafx.h
index 25993063..83710883 100644
--- a/src/libmodplug/stdafx.h
+++ b/src/libmodplug/stdafx.h
@@ -44,6 +44,8 @@ typedef signed int     int32_t;
 typedef unsigned char  uint8_t;
 typedef unsigned short uint16_t;
 typedef unsigned int   uint32_t;
+typedef __int64        int64_t;
+typedef unsigned __int64 uint64_t;
 #else
 #include <stdint.h>
 #endif