diff --git a/channel.c b/channel.c
index 777432940e..56d06978d2 100644
--- a/channel.c
+++ b/channel.c
@@ -3830,7 +3830,7 @@ static void copy_data_from_queue(struct ast_channel_spy_queue *queue, short *buf
 		}
 
 		tocopy = (f->samples > samples) ? samples : f->samples;
-		bytestocopy = ast_codec_get_len(queue->format, samples);
+		bytestocopy = ast_codec_get_len(queue->format, tocopy);
 		memcpy(buf, f->data, bytestocopy);
 		samples -= tocopy;
 		buf += tocopy;