diff --git a/common/lib/xmodule/xmodule/js/src/video/03_video_player.js b/common/lib/xmodule/xmodule/js/src/video/03_video_player.js
index b0c0454408..a95b9f2605 100644
--- a/common/lib/xmodule/xmodule/js/src/video/03_video_player.js
+++ b/common/lib/xmodule/xmodule/js/src/video/03_video_player.js
@@ -815,18 +815,18 @@ function (HTML5Video, Resizer) {
 
     function updatePlayTime(time, skip_seek) {
         var videoPlayer = this.videoPlayer,
-            duration = this.videoPlayer.duration(),
+            endTime = this.videoPlayer.duration(),
             youTubeId;
 
         if (this.config.endTime !== null) {
-            duration = Math.min(this.config.endTime, duration);
+            endTime = Math.min(this.config.endTime, endTime);
         }
 
         this.trigger(
             'videoProgressSlider.updatePlayTime',
             {
                 time: time,
-                duration: duration
+                duration: endTime
             }
         );
 
@@ -834,7 +834,7 @@ function (HTML5Video, Resizer) {
             'videoControl.updateVcrVidTime',
             {
                 time: time,
-                duration: duration
+                duration: endTime
             }
         );
 
diff --git a/common/lib/xmodule/xmodule/js/src/video/04_video_control.js b/common/lib/xmodule/xmodule/js/src/video/04_video_control.js
index c269ac4210..561c8c02d6 100644
--- a/common/lib/xmodule/xmodule/js/src/video/04_video_control.js
+++ b/common/lib/xmodule/xmodule/js/src/video/04_video_control.js
@@ -296,10 +296,10 @@ function () {
     }
 
     function updateVcrVidTime(params) {
-        var duration = (this.config.endTime !== null) ? this.config.endTime : params.duration;
+        var endTime = (this.config.endTime !== null) ? this.config.endTime : params.duration;
         // in case endTime is accidentally specified as being greater than the video
-        duration = Math.min(duration, params.duration);
-        this.videoControl.vidTimeEl.html(Time.format(params.time) + ' / ' + Time.format(duration));
+        endTime = Math.min(endTime, params.duration);
+        this.videoControl.vidTimeEl.html(Time.format(params.time) + ' / ' + Time.format(endTime));
     }
 
 });
diff --git a/common/lib/xmodule/xmodule/js/src/video/06_video_progress_slider.js b/common/lib/xmodule/xmodule/js/src/video/06_video_progress_slider.js
index a267bcf9c1..1fdaba37e2 100644
--- a/common/lib/xmodule/xmodule/js/src/video/06_video_progress_slider.js
+++ b/common/lib/xmodule/xmodule/js/src/video/06_video_progress_slider.js
@@ -164,10 +164,10 @@ function () {
 
     function onSlide(event, ui) {
         var time = ui.value,
-            duration = this.videoPlayer.duration();
+            endTime = this.videoPlayer.duration();
 
         if (this.config.endTime !== null) {
-            duration = Math.min(this.config.endTime, duration);
+            endTime = Math.min(this.config.endTime, endTime);
         }
 
         this.videoProgressSlider.frozen = true;
@@ -180,7 +180,7 @@ function () {
             'videoControl.updateVcrVidTime',
             {
                 time: time,
-                duration: duration
+                duration: endTime
             }
         );
 
@@ -226,10 +226,10 @@ function () {
         // params.duration could accidentally be construed as a floating
         // point double. Since we're displaying this number, round down
         // to nearest second
-        var duration = Math.floor(params.duration);
+        var endTime = Math.floor(params.duration);
 
         if (this.config.endTime !== null) {
-            duration = Math.min(this.config.endTime, duration);
+            endTime = Math.min(this.config.endTime, endTime);
         }
 
         if (
@@ -237,13 +237,13 @@ function () {
             !this.videoProgressSlider.frozen
         ) {
             this.videoProgressSlider.slider
-                .slider('option', 'max', duration)
+                .slider('option', 'max', endTime)
                 .slider('option', 'value', time);
         }
 
         // Update aria values.
         this.videoProgressSlider.handle.attr({
-            'aria-valuemax': duration,
+            'aria-valuemax': endTime,
             'aria-valuenow': time
         });
     }