diff --git a/isisd/isis_zebra.c b/isisd/isis_zebra.c
index 8a78417..1201627 100644
--- a/isisd/isis_zebra.c
+++ b/isisd/isis_zebra.c
@@ -420,7 +420,7 @@
   struct listnode *node;
   struct prefix_ipv6 prefix6;
 
-  if (CHECK_FLAG (route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED))
+  if (!CHECK_FLAG (route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED))
     return;
 
   api.vrf_id = VRF_DEFAULT;