diff --git a/libavformat/rtsp.c b/libavformat/rtsp.c
index 18538c78cf5c7acb5e539005488565b3a1b13e83..643e4d5a1f675b43b50f8740e5f12f32ec5640ff 100644
--- a/libavformat/rtsp.c
+++ b/libavformat/rtsp.c
@@ -1442,7 +1442,7 @@ int ff_rtsp_connect(AVFormatContext *s)
     char *option_list, *option, *filename;
     URLContext *rtsp_hd;
     int port, err, tcp_fd;
-    RTSPMessageHeader reply1, *reply = &reply1;
+    RTSPMessageHeader reply1 = {}, *reply = &reply1;
     int lower_transport_mask = 0;
     char real_challenge[64];
     struct sockaddr_storage peer;