diff --git a/src/extra/pktbuff.c b/src/extra/pktbuff.c
index 6dd0ca9..bc4db1b 100644
--- a/src/extra/pktbuff.c
+++ b/src/extra/pktbuff.c
@@ -9,6 +9,8 @@
  * This code has been sponsored by Vyatta Inc. <http://www.vyatta.com>
  */
 
+#define __USE_BSD
+
 #include <errno.h>
 #include <stdlib.h>
 #include <string.h> /* for memcpy */