diff --git a/src/htmlaudio/HTMLAudioInstance.ts b/src/htmlaudio/HTMLAudioInstance.ts
index 0eade48..7f7ad66 100644
--- a/src/htmlaudio/HTMLAudioInstance.ts
+++ b/src/htmlaudio/HTMLAudioInstance.ts
@@ -338,7 +338,7 @@ class HTMLAudioInstance extends EventEmitter implements IMediaInstance
             {
                 this._source.currentTime = start;
                 this._source.onloadedmetadata = null;
-                this.emit('progress', start, this._duration);
+                this.emit('progress', start / this._duration, this._duration);
                 Ticker.shared.add(this._onUpdate, this);
             }
         };