diff --git a/ripngd/ripng_interface.c b/ripngd/ripng_interface.c
index d70c299..c23d32a 100644
--- a/ripngd/ripng_interface.c
+++ b/ripngd/ripng_interface.c
@@ -243,8 +243,9 @@
     return 0;
 
   if (IS_RIPNG_DEBUG_ZEBRA)
-    zlog_debug ("interface up %s index %d flags %ld metric %d mtu %d",
-	       ifp->name, ifp->ifindex, ifp->flags, ifp->metric, ifp->mtu6);
+    zlog_debug ("interface up %s index %d flags %llx metric %d mtu %d",
+	       ifp->name, ifp->ifindex, (unsigned long long)ifp->flags,
+	       ifp->metric, ifp->mtu6);
 
   /* Check if this interface is RIPng enabled or not. */
   ripng_enable_apply (ifp);
@@ -276,7 +277,7 @@
   ripng_if_down (ifp);
 
   if (IS_RIPNG_DEBUG_ZEBRA)
-    zlog_debug ("interface down %s index %d flags %ld metric %d mtu %d",
+    zlog_debug ("interface down %s index %d flags %lld metric %d mtu %d",
 	       ifp->name, ifp->ifindex, ifp->flags, ifp->metric, ifp->mtu6);
 
   return 0;
@@ -291,7 +292,7 @@
   ifp = zebra_interface_add_read (zclient->ibuf);
 
   if (IS_RIPNG_DEBUG_ZEBRA)
-    zlog_debug ("RIPng interface add %s index %d flags %ld metric %d mtu %d",
+    zlog_debug ("RIPng interface add %s index %d flags %lld metric %d mtu %d",
 	       ifp->name, ifp->ifindex, ifp->flags, ifp->metric, ifp->mtu6);
 
   /* Check is this interface is RIP enabled or not.*/
@@ -324,7 +325,7 @@
     ripng_if_down(ifp);
   }
 
-  zlog_info("interface delete %s index %d flags %ld metric %d mtu %d",
+  zlog_info("interface delete %s index %d flags %lld metric %d mtu %d",
             ifp->name, ifp->ifindex, ifp->flags, ifp->metric, ifp->mtu6);
 
   /* To support pseudo interface do not free interface structure.  */