diff --git a/avconv.c b/avconv.c
index ebc6fd803efaaf9a1b1d1143a2e9bcb54316274c..0e123974d639db61de3168e7744ea058040a9d54 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)