diff --git a/httperf/src/idleconn.c b/httperf/src/idleconn.c
index 586c299..4f5a09f 100755
--- a/httperf/src/idleconn.c
+++ b/httperf/src/idleconn.c
@@ -32,6 +32,8 @@
     02110-1301, USA
 */
 
+#define _BSD_SOURCE
+
 #include <errno.h>
 #include <netdb.h>
 #include <signal.h>