diff --git a/stepmania/src/lua-5.1/src/luaconf.h b/stepmania/src/lua-5.1/src/luaconf.h
index 05af0a5d12..700b58f9a3 100644
--- a/stepmania/src/lua-5.1/src/luaconf.h
+++ b/stepmania/src/lua-5.1/src/luaconf.h
@@ -12,6 +12,7 @@
 #include <stddef.h>
 #if defined(_WIN32)
 typedef unsigned int uint32_t;
+typedef int int32_t;
 #else
 #include <inttypes.h>
 #endif