diff --git a/avconv.c b/avconv.c
index ebc6fd803e..0e123974d6 100644
--- a/avconv.c
+++ b/avconv.c
@@ -1135,7 +1135,6 @@ static void do_streamcopy(InputStream *ist, OutputStream *ost, const AVPacket *p
     }
 
     write_frame(of->ctx, &opkt, ost);
-    ost->st->codec->frame_number++;
 }
 
 int guess_input_channel_layout(InputStream *ist)