diff --git a/src/plugins/lua/weechat-lua.c b/src/plugins/lua/weechat-lua.c
index 8a6acea57..7f3b5ae3f 100644
--- a/src/plugins/lua/weechat-lua.c
+++ b/src/plugins/lua/weechat-lua.c
@@ -644,6 +644,8 @@ weechat_lua_command_cb (void *data, struct t_gui_buffer *buffer,
         {
             weechat_lua_unload_all ();
         }
+        else
+            return WEECHAT_RC_ERROR;
     }
     else
     {
@@ -693,12 +695,7 @@ weechat_lua_command_cb (void *data, struct t_gui_buffer *buffer,
             lua_quiet = 0;
         }
         else
-        {
-            weechat_printf (NULL,
-                            weechat_gettext ("%s%s: unknown option for "
-                                             "command \"%s\""),
-                            weechat_prefix ("error"), LUA_PLUGIN_NAME, "lua");
-        }
+            return WEECHAT_RC_ERROR;
     }
 
     return WEECHAT_RC_OK;