diff --git a/src/lib/util/aviio.c b/src/lib/util/aviio.c
index e3929aff0bc..4ca7079892d 100644
--- a/src/lib/util/aviio.c
+++ b/src/lib/util/aviio.c
@@ -2307,7 +2307,7 @@ static avi_error soundbuf_flush(avi_file *file, int only_flush_full)
 
 		/* add up the samples */
 		if (channelsamples > 0)
-			file->info.audio_numsamples = stream->samples += channelsamples;
+			file->info.audio_numsamples = stream->samples += chunksamples;
 
 		/* advance past those */
 		processedsamples += chunksamples;