diff --git a/proto/ospf/ospf.c b/proto/ospf/ospf.c
index bc9a636b..f459ddb7 100644
--- a/proto/ospf/ospf.c
+++ b/proto/ospf/ospf.c
@@ -288,7 +288,7 @@ ospf_get_route_info(rte *rte, byte *buf, ea_list *attrs)
     rte->u.ospf.metric2);
   if(rte->attrs->source==RTS_OSPF_EXT)
   {
-    buf += bsprintf(buf, " [%d]", rte->u.ospf.tag);
+    buf += bsprintf(buf, " [%u]", rte->u.ospf.tag);
   }
 }