diff --git a/libavformat/rtpenc_chain.c b/libavformat/rtpenc_chain.c
index e1f200ca08..63918adf49 100644
--- a/libavformat/rtpenc_chain.c
+++ b/libavformat/rtpenc_chain.c
@@ -70,8 +70,6 @@ AVFormatContext *ff_rtp_chain_mux_open(AVFormatContext *s, AVStream *st,
         return NULL;
     }
 
-    /* Copy the RTP AVStream timebase back to the original AVStream */
-    st->time_base = rtpctx->streams[0]->time_base;
     return rtpctx;
 }