diff --git a/epan/addr_resolv.c b/epan/addr_resolv.c
index 3b0c944..6f8786b 100644
--- a/epan/addr_resolv.c
+++ b/epan/addr_resolv.c
@@ -2531,6 +2531,7 @@ _host_name_lookup_cleanup(void) {
   }
 
   g_list_free(async_dns_queue_head);
+  async_dns_queue_head = NULL;
 
   if (async_dns_initialized) {
     ares_destroy(ghba_chan);