diff --git a/src/nm-ip6-config.c b/src/nm-ip6-config.c
index 9c0763040..1096fb424 100644
--- a/src/nm-ip6-config.c
+++ b/src/nm-ip6-config.c
@@ -681,7 +681,7 @@ nm_ip6_config_merge_setting (NMIP6Config *self,
 
 		nm_utils_ip6_address_clear_host_address (&route.network, &route.network, route.plen);
 
-		_nm_ip_config_merge_route_attributes (AF_INET,
+		_nm_ip_config_merge_route_attributes (AF_INET6,
 		                                      s_route,
 		                                      NM_PLATFORM_IP_ROUTE_CAST (&route),
 		                                      route_table);