diff --git a/src/network/networkd-address.c b/src/network/networkd-address.c
index 19462d9a0ad..37be7944a83 100644
--- a/src/network/networkd-address.c
+++ b/src/network/networkd-address.c
@@ -570,6 +570,7 @@ int address_configure(
         assert(link->ifindex > 0);
         assert(link->manager);
         assert(link->manager->rtnl);
+        assert(callback);
 
         /* If this is a new address, then refuse adding more than the limit */
         if (address_get(link, address->family, &address->in_addr, address->prefixlen, NULL) <= 0 &&
diff --git a/src/network/networkd-route.c b/src/network/networkd-route.c
index edcfa604ed6..78a323954a3 100644
--- a/src/network/networkd-route.c
+++ b/src/network/networkd-route.c
@@ -513,6 +513,7 @@ int route_configure(
         assert(link->manager->rtnl);
         assert(link->ifindex > 0);
         assert(IN_SET(route->family, AF_INET, AF_INET6));
+        assert(callback);
 
         if (route_get(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL) <= 0 &&
             set_size(link->routes) >= routes_max())