diff --git a/osx.c b/osx.c
index 23879c1..7945ad1 100644
--- a/osx.c
+++ b/osx.c
@@ -276,6 +276,26 @@ static int os_dir_open(lua_State *L)
     return 1;
 }
 
+static int os_dir_tostring(lua_State *L)
+{
+    df_os_dir *dir = luaL_checkudata(L, 1, DF_LUA_DIRHANDLE);
+
+    if (dir->closeflag) {
+        lua_pushliteral(L, "directory (closed)");
+    } else {
+        df_os_dirhn hn = dir->hn;
+        void *p;
+
+#ifdef _WIN32
+        p = (void *) hn->dirh;
+#else
+        p = hn;
+#endif
+        lua_pushfstring(L, "directory (%p)", p);
+    }
+    return 1;
+}
+
 static int os_dir_close(lua_State *L)
 {
     df_os_dir *dir = todir(L);
@@ -624,6 +644,7 @@ static void createmeta(lua_State *L)
 {
     static const luaL_Reg metameth[] = {
         { "__index", NULL },  // placeholder
+        { "__tostring", os_dir_tostring },
         { "__gc", os_dir_gc },
 #if LUA_VERSION_NUM >= 504
         { "__close", os_dir_gc},