diff --git a/rtcllm/vad.py b/rtcllm/vad.py
index 08a26d9..555bde8 100644
--- a/rtcllm/vad.py
+++ b/rtcllm/vad.py
@@ -126,7 +126,7 @@ class AudioTrackVad(MediaStreamTrack):
 	
 	def voice_duration(self):
 		duration = 0
-		[ f.samples * 1000 / f.sample_rate + duration for f in self.self.voiced_frames ]
+		[ f.samples * 1000 / f.sample_rate + duration for f in self.voiced_frames ]
 		return duration
 
 	async def write_wave(self):