diff --git a/js/ui/components/telepathyClient.js b/js/ui/components/telepathyClient.js
index c316084a2..1292d9a00 100644
--- a/js/ui/components/telepathyClient.js
+++ b/js/ui/components/telepathyClient.js
@@ -147,8 +147,8 @@ class TelepathyClient extends Tp.BaseClient {
             this._delegatedChannelsCb.bind(this));
     }
 
-    vfunc_observe_channels(account, conn, channels,
-                                     dispatchOp, requests, context) {
+    vfunc_observe_channels(...args) {
+        let [account, conn, channels, dispatchOp, requests, context] = args;
         let len = channels.length;
         for (let i = 0; i < len; i++) {
             let channel = channels[i];
@@ -180,8 +180,8 @@ class TelepathyClient extends Tp.BaseClient {
         });
     }
 
-    vfunc_handle_channels(account, conn, channels, requests,
-                                    user_action_time, context) {
+    vfunc_handle_channels(...args) {
+        let [account, conn, channels, requests, user_action_time, context] = args;
         this._handlingChannels(account, conn, channels, true);
         context.accept();
     }
@@ -220,8 +220,8 @@ class TelepathyClient extends Tp.BaseClient {
         }
     }
 
-    vfunc_add_dispatch_operation(account, conn, channels,
-                                           dispatchOp, context) {
+    vfunc_add_dispatch_operation(...args) {
+        let [account, conn, channels, dispatchOp, context] = args;
         let channel = channels[0];
         let chanType = channel.get_channel_type();
 
diff --git a/js/ui/tweener.js b/js/ui/tweener.js
index 26f3aeb0e..3656f8119 100644
--- a/js/ui/tweener.js
+++ b/js/ui/tweener.js
@@ -129,10 +129,8 @@ function resumeTweens(...args) {
 }
 
 
-function registerSpecialProperty(name, getFunction, setFunction,
-                                 parameters, preProcessFunction) {
-    Tweener.registerSpecialProperty(name, getFunction, setFunction,
-                                    parameters, preProcessFunction);
+function registerSpecialProperty(...args) {
+    Tweener.registerSpecialProperty(...args);
 }
 
 function registerSpecialPropertyModifier(name, modifyFunction, getFunction) {