diff --git a/src/core/ipv4/ip4_napt.c b/src/core/ipv4/ip4_napt.c
index b51c2f919..0cf228cef 100644
--- a/src/core/ipv4/ip4_napt.c
+++ b/src/core/ipv4/ip4_napt.c
@@ -176,6 +176,8 @@ static void
 ip_napt_deinit(void)
 {
   napt_list = NO_IDX;
+  napt_list_last = NO_IDX;
+  napt_free = 0;
   ip_napt_max = 0;
 #if IP_NAPT_PORTMAP
   ip_portmap_max = 0;