diff --git a/src/network/networkd-manager.c b/src/network/networkd-manager.c
index 13f038bf95..8dcf6765c9 100644
--- a/src/network/networkd-manager.c
+++ b/src/network/networkd-manager.c
@@ -1291,7 +1291,7 @@ static int dhcp6_route_remove_callback(sd_netlink *nl, sd_netlink_message *m,
         return 0;
 }
 
-int manager_dhcp6_prefix_remove(Manager *m, struct in6_addr *addr) {
+static int manager_dhcp6_prefix_remove(Manager *m, struct in6_addr *addr) {
         Link *l;
         int r;
         Route *route;
diff --git a/src/network/networkd-manager.h b/src/network/networkd-manager.h
index fbfcdad304..726a4d2d40 100644
--- a/src/network/networkd-manager.h
+++ b/src/network/networkd-manager.h
@@ -94,7 +94,6 @@ int manager_request_product_uuid(Manager *m, Link *link);
 
 Link *manager_dhcp6_prefix_get(Manager *m, struct in6_addr *addr);
 int manager_dhcp6_prefix_add(Manager *m, struct in6_addr *addr, Link *link);
-int manager_dhcp6_prefix_remove(Manager *m, struct in6_addr *addr);
 int manager_dhcp6_prefix_remove_all(Manager *m, Link *link);
 
 DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free);