diff --git a/contrib/package/freifunk-watchdog/src/watchdog.h b/contrib/package/freifunk-watchdog/src/watchdog.h
index 3aa8876400..6f2382de38 100644
--- a/contrib/package/freifunk-watchdog/src/watchdog.h
+++ b/contrib/package/freifunk-watchdog/src/watchdog.h
@@ -29,6 +29,7 @@
 #include <math.h>
 #include <time.h>
 #include <signal.h>
+#include <limits.h>
 #include <sys/wait.h>
 #include <sys/stat.h>
 #include <sys/ioctl.h>