diff --git a/app/javascript/mastodon/features/audio/index.js b/app/javascript/mastodon/features/audio/index.js
index 2992e3662..434148e8e 100644
--- a/app/javascript/mastodon/features/audio/index.js
+++ b/app/javascript/mastodon/features/audio/index.js
@@ -246,7 +246,7 @@ class Audio extends React.PureComponent {
   handleTimeUpdate = () => {
     this.setState({
       currentTime: this.audio.currentTime,
-      duration: Math.floor(this.audio.duration),
+      duration: this.audio.duration,
     });
   }
 
@@ -454,7 +454,7 @@ class Audio extends React.PureComponent {
               <span className='video-player__time'>
                 <span className='video-player__time-current'>{formatTime(Math.floor(currentTime))}</span>
                 <span className='video-player__time-sep'>/</span>
-                <span className='video-player__time-total'>{formatTime(this.state.duration || Math.floor(this.props.duration))}</span>
+                <span className='video-player__time-total'>{formatTime(Math.floor(this.state.duration || this.props.duration))}</span>
               </span>
             </div>
 
diff --git a/app/javascript/mastodon/features/video/index.js b/app/javascript/mastodon/features/video/index.js
index 642722193..229a92140 100644
--- a/app/javascript/mastodon/features/video/index.js
+++ b/app/javascript/mastodon/features/video/index.js
@@ -198,7 +198,7 @@ class Video extends React.PureComponent {
   handleTimeUpdate = () => {
     this.setState({
       currentTime: this.video.currentTime,
-      duration: Math.floor(this.video.duration),
+      duration:this.video.duration,
     });
   }
 
@@ -551,7 +551,7 @@ class Video extends React.PureComponent {
                 <span className='video-player__time'>
                   <span className='video-player__time-current'>{formatTime(Math.floor(currentTime))}</span>
                   <span className='video-player__time-sep'>/</span>
-                  <span className='video-player__time-total'>{formatTime(duration)}</span>
+                  <span className='video-player__time-total'>{formatTime(Math.floor(duration))}</span>
                 </span>
               )}