diff --git a/include/types/hlua.h b/include/types/hlua.h
index 82e80c4..357f7ab 100644
--- a/include/types/hlua.h
+++ b/include/types/hlua.h
@@ -16,6 +16,7 @@
 #define CLASS_SOCKET   "Socket"
 #define CLASS_CHANNEL  "Channel"
 #define CLASS_HTTP     "HTTP"
+#define CLASS_MAP      "Map"
 
 struct stream;