diff --git a/libavformat/rtsp.c b/libavformat/rtsp.c
index d601d63a89..ea989e4925 100644
--- a/libavformat/rtsp.c
+++ b/libavformat/rtsp.c
@@ -1813,7 +1813,8 @@ redirect:
     } else if (!strcmp(proto, "satip")) {
         av_strlcpy(proto, "rtsp", sizeof(proto));
         rt->server_type = RTSP_SERVER_SATIP;
-    }
+    } else if (strcmp(proto, "rtsp"))
+        return AVERROR_INVALIDDATA;
 
     if (*auth) {
         av_strlcpy(rt->auth, auth, sizeof(rt->auth));