diff --git a/panelManager.js b/panelManager.js
index 0ddc641..20ee12d 100755
--- a/panelManager.js
+++ b/panelManager.js
@@ -611,7 +611,7 @@ var IconAnimator = Utils.defineClass({
     destroy: function() {
         this._timeline.stop();
         this._timeline = null;
-        for (const name in this._animations) {
+        for (let name in this._animations) {
             const pairs = this._animations[name];
             for (let i = 0, iMax = pairs.length; i < iMax; i++) {
                 const pair = pairs[i];
@@ -637,7 +637,7 @@ var IconAnimator = Utils.defineClass({
 
     addAnimation: function(target, name) {
         const targetDestroyId = target.connect('destroy', () => this.removeAnimation(target, name));
-        this._animations[name].push({ target, targetDestroyId });
+        this._animations[name].push({ target: target, targetDestroyId: targetDestroyId });
         if (this._started && this._count === 0) {
             this._timeline.start();
         }
diff --git a/panelSettings.js b/panelSettings.js
index 3eeac9b..4feb3fd 100644
--- a/panelSettings.js
+++ b/panelSettings.js
@@ -47,7 +47,7 @@ function getPanelSize(settings, monitorIndex) {
 
 function setPanelSize(settings, monitorIndex, value) {
     if (!(Number.isInteger(value) && value <= 128 && value >= 16)) {
-        log(`Not setting invalid panel size: ${value}`);
+        log('Not setting invalid panel size: ' + value);
         return;
     }
     let sizes = getSettingsJson(settings, 'panel-sizes');
@@ -67,7 +67,7 @@ function getPanelLength(settings, monitorIndex) {
 
 function setPanelLength(settings, monitorIndex, value) {
     if (!(Number.isInteger(value) && value <= 100 && value >= 0)) {
-        log(`Not setting invalid panel length: ${value}`);
+        log('Not setting invalid panel length: ' + value);
         return;
     }
     let lengths = getSettingsJson(settings, 'panel-lengths');
@@ -86,7 +86,7 @@ function getPanelPosition(settings, monitorIndex) {
 function setPanelPosition(settings, monitorIndex, value) {
     if (!(value === Pos.TOP || value === Pos.BOTTOM || value === Pos.LEFT
         || value === Pos.RIGHT)) {
-        log(`Not setting invalid panel position: ${value}`);
+        log('Not setting invalid panel position: ' + value);
         return;
     }
     const positions = getSettingsJson(settings, 'panel-positions');
@@ -103,7 +103,7 @@ function getPanelAnchor(settings, monitorIndex) {
 
 function setPanelAnchor(settings, monitorIndex, value) {
     if (!(value === Pos.START || value === Pos.MIDDLE || value === Pos.END)) {
-        log(`Not setting invalid panel anchor: ${value}`);
+        log('Not setting invalid panel anchor: ' + value);
         return;
     }
     const anchors = getSettingsJson(settings, 'panel-anchors');
diff --git a/progress.js b/progress.js
index 33cacff..1e84e82 100644
--- a/progress.js
+++ b/progress.js
@@ -579,7 +579,7 @@ var ProgressIndicator = Utils.defineClass({
         this._isUrgent = false;
     },
 
-    setUrgent(urgent) {
+    setUrgent: function(urgent) {
         const icon = this._source.icon._iconBin;
         if (urgent) {
             if (!this._isUrgent) {