diff --git a/cloudinit/netinfo.py b/cloudinit/netinfo.py
index 628e2908f12..a93344e09a2 100644
--- a/cloudinit/netinfo.py
+++ b/cloudinit/netinfo.py
@@ -300,6 +300,7 @@ def _netdev_route_info_iproute(iproute_data):
             toks = line.split()
             if toks[0] == "default":
                 entry['destination'] = "::/0"
+                entry['gateway'] = "::"
                 entry['flags'] = "UG"
             else:
                 entry['destination'] = toks[0]