diff --git a/src/kern/npf_tableset.c b/src/kern/npf_tableset.c
index 8492b17..842cb68 100644
--- a/src/kern/npf_tableset.c
+++ b/src/kern/npf_tableset.c
@@ -736,15 +736,17 @@ table_ent_copyout(const npf_addr_t *addr, const int alen, npf_netmask_t mask,
 }
 
 static int
-table_generic_list(const npf_table_t *t, void *ubuf, size_t len)
+table_generic_list(npf_table_t *t, void *ubuf, size_t len)
 {
 	npf_tblent_t *ent;
 	size_t off = 0;
 	int error = 0;
 
 	LIST_FOREACH(ent, &t->t_list, te_listent) {
+		mutex_exit(&t->t_lock);
 		error = table_ent_copyout(&ent->te_addr,
 		    ent->te_alen, ent->te_preflen, ubuf, len, &off);
+		mutex_enter(&t->t_lock);
 		if (error)
 			break;
 	}