diff --git a/libavformat/rtpproto.c b/libavformat/rtpproto.c
index 451d8114e5..2062083aee 100644
--- a/libavformat/rtpproto.c
+++ b/libavformat/rtpproto.c
@@ -323,6 +323,7 @@ static int rtp_open(URLContext *h, const char *uri, int flags)
     char path[1024];
     const char *p;
     int i, max_retry_count = 3;
+    int rtcpflags;
 
     av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &rtp_port,
                  path, sizeof(path), uri);
@@ -388,12 +389,13 @@ static int rtp_open(URLContext *h, const char *uri, int flags)
             s->local_rtpport = -1;
             continue;
         }
+        rtcpflags = flags | AVIO_FLAG_WRITE;
         if (s->local_rtcpport < 0) {
             s->local_rtcpport = s->local_rtpport + 1;
             build_udp_url(s, buf, sizeof(buf),
                           hostname, s->rtcp_port, s->local_rtcpport,
                           sources, block);
-            if (ffurl_open_whitelist(&s->rtcp_hd, buf, flags,
+            if (ffurl_open_whitelist(&s->rtcp_hd, buf, rtcpflags,
                                      &h->interrupt_callback, NULL,
                                      h->protocol_whitelist, h->protocol_blacklist) < 0) {
                 s->local_rtpport = s->local_rtcpport = -1;
@@ -404,7 +406,7 @@ static int rtp_open(URLContext *h, const char *uri, int flags)
         build_udp_url(s, buf, sizeof(buf),
                       hostname, s->rtcp_port, s->local_rtcpport,
                       sources, block);
-        if (ffurl_open_whitelist(&s->rtcp_hd, buf, flags, &h->interrupt_callback,
+        if (ffurl_open_whitelist(&s->rtcp_hd, buf, rtcpflags, &h->interrupt_callback,
                                  NULL, h->protocol_whitelist, h->protocol_blacklist) < 0)
             goto fail;
         break;
diff --git a/libavformat/rtsp.c b/libavformat/rtsp.c
index 64f8c91950..485e35626d 100644
--- a/libavformat/rtsp.c
+++ b/libavformat/rtsp.c
@@ -2316,7 +2316,7 @@ static int sdp_read_header(AVFormatContext *s)
             append_source_addrs(url, sizeof(url), "block",
                                 rtsp_st->nb_exclude_source_addrs,
                                 rtsp_st->exclude_source_addrs);
-            err = ffurl_open_whitelist(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
+            err = ffurl_open_whitelist(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ,
                            &s->interrupt_callback, &opts, s->protocol_whitelist, s->protocol_blacklist);
 
             av_dict_free(&opts);