diff --git a/include/utils.h b/include/utils.h
index 301ac27..73aa754 100644
--- a/include/utils.h
+++ b/include/utils.h
@@ -29,6 +29,7 @@
 #include <string>
 #include <set>
 #include <stdint.h>
+#include "packetsender.h"
 
 namespace Tins {
     /** \brief Network utils namespace.
diff --git a/src/packetsender.cpp b/src/packetsender.cpp
index 46d6367..6dd13dd 100644
--- a/src/packetsender.cpp
+++ b/src/packetsender.cpp
@@ -46,7 +46,7 @@ Tins::PacketSender::PacketSender(uint32_t recv_timeout) : _sockets(SOCKETS_END,
 Tins::PacketSender::~PacketSender() {
     for(unsigned i(0); i < _sockets.size(); ++i) {
         if(_sockets[i] != INVALID_RAW_SOCKET)
-            ::close(sockets[i]);
+            ::close(_sockets[i]);
     }
 }
 
diff --git a/src/utils.cpp b/src/utils.cpp
index a6fc2e1..7522a99 100644
--- a/src/utils.cpp
+++ b/src/utils.cpp
@@ -156,7 +156,7 @@ uint32_t Tins::Utils::resolve_ip(const string &to_resolve) {
 }
 
 bool Tins::Utils::resolve_hwaddr(uint32_t ip, uint8_t *buffer, PacketSender *sender) {
-    
+    return false;
 }
 
 set<string> Tins::Utils::network_interfaces() {