diff --git a/src/dns/res.c b/src/dns/res.c
index 78a25f2..25d7143 100644
--- a/src/dns/res.c
+++ b/src/dns/res.c
@@ -4,6 +4,7 @@
  * Copyright (C) 2010 Creytiv.com
  */
 #define _BSD_SOURCE 1
+#define _DEFAULT_SOURCE 1
 #include <sys/types.h>
 #include <netinet/in.h>
 #include <arpa/nameser.h>
diff --git a/src/net/linux/rt.c b/src/net/linux/rt.c
index 7e03587..2152af1 100644
--- a/src/net/linux/rt.c
+++ b/src/net/linux/rt.c
@@ -4,6 +4,7 @@
  * Copyright (C) 2010 Creytiv.com
  */
 #define _BSD_SOURCE 1
+#define _DEFAULT_SOURCE 1
 #include <string.h>
 #include <unistd.h>
 #define __USE_POSIX 1  /**< Use POSIX flag */
diff --git a/src/net/net.c b/src/net/net.c
index ab84e56..33b35ff 100644
--- a/src/net/net.c
+++ b/src/net/net.c
@@ -4,6 +4,7 @@
  * Copyright (C) 2010 Creytiv.com
  */
 #define _BSD_SOURCE 1
+#define _DEFAULT_SOURCE 1
 #include <stdlib.h>
 #include <string.h>
 #if !defined(WIN32) && !defined(CYGWIN)
diff --git a/src/net/rt.c b/src/net/rt.c
index 0f7d33f..f5d2ef5 100644
--- a/src/net/rt.c
+++ b/src/net/rt.c
@@ -4,6 +4,7 @@
  * Copyright (C) 2010 Creytiv.com
  */
 #define _BSD_SOURCE 1
+#define _DEFAULT_SOURCE 1
 #include <re_types.h>
 #include <re_fmt.h>
 #include <re_mbuf.h>
diff --git a/src/sa/pton.c b/src/sa/pton.c
index 2707527..1779782 100644
--- a/src/sa/pton.c
+++ b/src/sa/pton.c
@@ -8,6 +8,7 @@
 #include <windows.h>
 #else
 #define _BSD_SOURCE 1    /**< Use BSD code */
+#define _DEFAULT_SOURCE 1
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <arpa/inet.h>
diff --git a/src/sa/sa.c b/src/sa/sa.c
index 1ce167e..1d293bd 100644
--- a/src/sa/sa.c
+++ b/src/sa/sa.c
@@ -4,6 +4,7 @@
  * Copyright (C) 2010 Creytiv.com
  */
 #define _BSD_SOURCE 1
+#define _DEFAULT_SOURCE 1
 #include <string.h>
 #include <re_types.h>
 #include <re_fmt.h>
diff --git a/src/udp/mcast.c b/src/udp/mcast.c
index 5281f29..327257a 100644
--- a/src/udp/mcast.c
+++ b/src/udp/mcast.c
@@ -5,6 +5,7 @@
  */
 
 #define _BSD_SOURCE 1
+#define _DEFAULT_SOURCE 1
 #include <re_types.h>
 #include <re_fmt.h>
 #include <re_sa.h>