diff --git a/sys/net/crosslayer/net_help/inet_pton.c b/sys/net/crosslayer/net_help/inet_pton.c
index de773e9d06..a32e3107af 100644
--- a/sys/net/crosslayer/net_help/inet_pton.c
+++ b/sys/net/crosslayer/net_help/inet_pton.c
@@ -18,6 +18,8 @@
 #include <string.h>
 #include <stdint.h>
 
+#include "kernel.h"
+
 #include "inet_pton.h"
 
 /* int