diff --git a/core/contiki-net.h b/core/contiki-net.h
index 3bed481a6..9f443bd5c 100644
--- a/core/contiki-net.h
+++ b/core/contiki-net.h
@@ -44,6 +44,7 @@
 #include "net/uip_arp.h"
 #include "net/uiplib.h"
 #include "net/uip-udp-packet.h"
+#include "net/simple-udp.h"
 
 #if UIP_CONF_IPV6
 #include "net/uip-icmp6.h"
diff --git a/core/net/simple-udp.c b/core/net/simple-udp.c
index 75537f172..38b7ef77e 100644
--- a/core/net/simple-udp.c
+++ b/core/net/simple-udp.c
@@ -41,8 +41,11 @@
  *
  */
 
-#include "simple-udp.h"
 #include "contiki-net.h"
+#include "net/simple-udp.h"
+
+#include <stdlib.h>
+
 
 PROCESS(simple_udp_process, "Simple UDP process");
 static uint8_t started = 0;