diff --git a/zone/lua_parser.cpp b/zone/lua_parser.cpp
index 84ee44319..4ae02a326 100644
--- a/zone/lua_parser.cpp
+++ b/zone/lua_parser.cpp
@@ -909,7 +909,7 @@ void LuaParser::ReloadQuests() {
 #error Incompatible lua version
 #endif
 
-#ifdef WINDOWS
+#ifdef _WINDOWS
 	const char libext[] = ".dll";
 #else
 	// lua doesn't care OSX doesn't use sonames