diff --git a/libavformat/msnwc_tcp.c b/libavformat/msnwc_tcp.c
index 60225af61c..2ec18fb554 100644
--- a/libavformat/msnwc_tcp.c
+++ b/libavformat/msnwc_tcp.c
@@ -67,7 +67,7 @@ static int msnwc_tcp_probe(AVProbeData *p)
         }
     }
 
-    return -1;
+    return 0;
 }
 
 static int msnwc_tcp_read_header(AVFormatContext *ctx)