diff --git a/lms/static/coffee/src/modules/video/video_player.coffee b/lms/static/coffee/src/modules/video/video_player.coffee
index 0dd52a128b..20df378267 100644
--- a/lms/static/coffee/src/modules/video/video_player.coffee
+++ b/lms/static/coffee/src/modules/video/video_player.coffee
@@ -135,7 +135,7 @@ class @VideoPlayer
     @video.speed
 
   volume: (value) ->
-    if value != undefined
+    if value?
       @player.setVolume value
     else
       @player.getVolume()