diff --git a/audio/audio.go b/audio/audio.go
index 9a39db189..aaa52f385 100644
--- a/audio/audio.go
+++ b/audio/audio.go
@@ -399,11 +399,6 @@ func (p *Player) SetVolume(volume float64) {
 	p.p.SetVolume(volume)
 }
 
-// UnplayedBufferSize returns the amount of unplayed data in the player's buffer in the time duration.
-func (p *Player) UnplayedBufferSize() time.Duration {
-	return p.p.UnplayedBufferSize()
-}
-
 // SetBufferSize adjusts the buffer size of the player.
 // If 0 is specified, the default buffer size is used.
 // A small buffer size is useful if you want to play a real-time PCM for example.
diff --git a/audio/player.go b/audio/player.go
index f196bc1f8..bc462f703 100644
--- a/audio/player.go
+++ b/audio/player.go
@@ -286,18 +286,6 @@ func (p *playerImpl) Err() error {
 	return p.player.Err()
 }
 
-func (p *playerImpl) UnplayedBufferSize() time.Duration {
-	p.m.Lock()
-	defer p.m.Unlock()
-
-	if p.player == nil {
-		return 0
-	}
-
-	samples := p.player.UnplayedBufferSize() / bytesPerSample
-	return time.Duration(samples) * time.Second / time.Duration(p.factory.sampleRate)
-}
-
 func (p *playerImpl) SetBufferSize(bufferSize int) {
 	p.m.Lock()
 	defer p.m.Unlock()