diff --git a/static/mobile/js/VideoPlayer.js b/static/mobile/js/VideoPlayer.js
index c1f34850..95720e2d 100644
--- a/static/mobile/js/VideoPlayer.js
+++ b/static/mobile/js/VideoPlayer.js
@@ -360,14 +360,24 @@ window.VideoPlayer = function(options) {
         progressbar.setAttribute('aria-valuenow', value);
 
     }
-    that.querySelector('.controls .position input').addEventListener('input', function(event){
+    that.querySelector('.controls .position input').addEventListener('input', event => {
         event.preventDefault()
         event.stopPropagation()
-        setProgressPosition(this.value)
-        var position = this.value/100 * self.options.duration
+        setProgressPosition(event.target.value)
+        var position = event.target.value/100 * self.options.duration
+        displayTime(position)
         that.currentTime(position)
         hideControlsLater()
     })
+    function displayTime(currentTime) {
+        duration = formatDuration(self.options.duration)
+        currentTime = formatDuration(currentTime)
+        while (duration && duration.startsWith('00:')) {
+            duration = duration.slice(3)
+        }
+        currentTime = currentTime.slice(currentTime.length - duration.length)
+        time.innerText = `${currentTime} / ${duration}`
+    }
 
     that.addEventListener("timeupdate", event => {
         var currentTime = that.currentTime(),
@@ -376,14 +386,7 @@ window.VideoPlayer = function(options) {
             currentTime -= self.options.position
         }
         setProgressPosition(100 * currentTime / duration)
-        duration = formatDuration(duration)
-        currentTime = formatDuration(currentTime)
-        while (duration && duration.startsWith('00:')) {
-            duration = duration.slice(3)
-        }
-        currentTime = currentTime.slice(currentTime.length - duration.length)
-        time.innerText = `${currentTime} / ${duration}`
-
+        displayTime(currentTime)
     })
 
     that.addEventListener("play", event => {