--- a/handlers.h
+++ b/handlers.h
@@ -30,7 +30,8 @@
 #ifdef WIN32
 #define IFN_SIZE 512 // on windows iface names are VEERY long
 #else
-#define IFN_SIZE 32 // iface name size. As in linux/sockios.h
+#include <net/if.h>
+#define IFN_SIZE IFNAMSIZ // iface name size. As in linux/sockios.h
 #endif
 
 #define MPH_IFLIST 0x2 // iface type - for mempool