diff --git a/sysdep/bsd/krt-sock.c b/sysdep/bsd/krt-sock.c
index 72295906..1647c5ea 100644
--- a/sysdep/bsd/krt-sock.c
+++ b/sysdep/bsd/krt-sock.c
@@ -181,7 +181,7 @@ krt_sock_send(int cmd, rte *e)
   msg.rtm.rtm_msglen = l;
 
   if ((l = write(rt_sock, (char *)&msg, l)) < 0) {
-    log(L_ERR "KRT: Error sending route %I/%d to kernel", net->n.prefix, net->n.pxlen);
+    log(L_ERR "KRT: Error sending route %I/%d to kernel: %m", net->n.prefix, net->n.pxlen);
     return -1;
   }