diff --git a/gst/udp/gstudpsrc.c b/gst/udp/gstudpsrc.c
index dce2c9981a..3377df24f7 100644
--- a/gst/udp/gstudpsrc.c
+++ b/gst/udp/gstudpsrc.c
@@ -491,7 +491,8 @@ retry:
   if (G_UNLIKELY (!readsize)) {
     /* try to read a packet (and it will be ignored),
      * in case a packet with no data arrived */
-    recvfrom (udpsrc->sock.fd, (char *)&slen, 0, 0, &sa.sa, &slen);
+    slen = sizeof (sa);
+    recvfrom (udpsrc->sock.fd, (char *) &slen, 0, 0, &sa.sa, &slen);
 
     /* clear any error, in case a poll error occurred */
     clear_error (udpsrc);