diff --git a/src/network/networkd-address-pool.c b/src/network/networkd-address-pool.c
index a9f8872760..c60ece5db8 100644
--- a/src/network/networkd-address-pool.c
+++ b/src/network/networkd-address-pool.c
@@ -107,6 +107,15 @@ static bool address_pool_prefix_is_taken(
                                 return true;
                 }
 
+                /* Don't clash with assigned foreign addresses */
+                SET_FOREACH(a, l->addresses_foreign) {
+                        if (a->family != p->family)
+                                continue;
+
+                        if (in_addr_prefix_intersect(p->family, u, prefixlen, &a->in_addr, a->prefixlen))
+                                return true;
+                }
+
                 /* Don't clash with addresses already pulled from the pool, but not assigned yet */
                 SET_FOREACH(a, l->pool_addresses) {
                         if (a->family != p->family)