diff --git a/lauxlib.c b/lauxlib.c
index 2138b28e..d31fac83 100644
--- a/lauxlib.c
+++ b/lauxlib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lauxlib.c,v 1.252 2013/06/14 18:34:49 roberto Exp roberto $
+** $Id: lauxlib.c,v 1.253 2013/06/14 20:46:40 roberto Exp roberto $
 ** Auxiliary functions for building Lua libraries
 ** See Copyright Notice in lua.h
 */
@@ -731,13 +731,13 @@ LUALIB_API int luaL_callmeta (lua_State *L, int obj, const char *event) {
 }
 
 
-LUALIB_API int luaL_len (lua_State *L, int idx) {
-  int l;
+LUALIB_API lua_Integer luaL_len (lua_State *L, int idx) {
+  lua_Integer l;
   int isnum;
   lua_len(L, idx);
-  l = (int)lua_tointegerx(L, -1, &isnum);
+  l = lua_tointegerx(L, -1, &isnum);
   if (!isnum)
-    luaL_error(L, "object length is not a number");
+    luaL_error(L, "object length is not an integer");
   lua_pop(L, 1);  /* remove object */
   return l;
 }
diff --git a/lauxlib.h b/lauxlib.h
index c1aa67c8..360dea13 100644
--- a/lauxlib.h
+++ b/lauxlib.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lauxlib.h,v 1.119 2011/11/14 17:10:24 roberto Exp roberto $
+** $Id: lauxlib.h,v 1.120 2011/11/29 15:55:08 roberto Exp roberto $
 ** Auxiliary functions for building Lua libraries
 ** See Copyright Notice in lua.h
 */
@@ -83,7 +83,7 @@ LUALIB_API int (luaL_loadstring) (lua_State *L, const char *s);
 
 LUALIB_API lua_State *(luaL_newstate) (void);
 
-LUALIB_API int (luaL_len) (lua_State *L, int idx);
+LUALIB_API lua_Integer (luaL_len) (lua_State *L, int idx);
 
 LUALIB_API const char *(luaL_gsub) (lua_State *L, const char *s, const char *p,
                                                   const char *r);