diff --git a/src/common/dns_resolve.cc b/src/common/dns_resolve.cc
index a44510d6deab3..435bcc657e403 100644
--- a/src/common/dns_resolve.cc
+++ b/src/common/dns_resolve.cc
@@ -56,6 +56,7 @@ DNSResolver::~DNSResolver()
 #ifdef HAVE_RES_NQUERY
   for (auto iter = states.begin(); iter != states.end(); ++iter) {
     struct __res_state *s = *iter;
+    res_nclose(s);
     delete s;
   }
 #endif