diff --git a/src/tolua/tolua_map.c b/src/tolua/tolua_map.c
index 148c387..9c0d5d0 100644
--- a/src/tolua/tolua_map.c
+++ b/src/tolua/tolua_map.c
@@ -25,7 +25,7 @@
 /* Create metatable
     * Create and register new metatable
 */
-static int tolua_newmetatable( lua_State* L, char* name )
+static int tolua_newmetatable( lua_State* L, const char* name )
 {
     int r = luaL_newmetatable( L, name );
 #ifdef LUA_VERSION_NUM /* only lua 5.1 */