diff --git a/ospfd/ospfd.c b/ospfd/ospfd.c
index d1de29d..3e2b234 100644
--- a/ospfd/ospfd.c
+++ b/ospfd/ospfd.c
@@ -223,7 +223,7 @@
     }
   new->maxsndbuflen = getsockopt_so_sendbuf (new->fd);
   if (IS_DEBUG_OSPF (zebra, ZEBRA_INTERFACE))
-    zlog_debug ("%s: starting with OSPF send buffer size %d",
+    zlog_debug ("%s: starting with OSPF send buffer size %u",
       __func__, new->maxsndbuflen);
   if ((new->ibuf = stream_new(OSPF_MAX_PACKET_SIZE+1)) == NULL)
     {