diff --git a/cpu/msp430/clock.c b/cpu/msp430/clock.c
index 696cce1ef..5965e1e92 100644
--- a/cpu/msp430/clock.c
+++ b/cpu/msp430/clock.c
@@ -41,6 +41,7 @@
 #include "sys/clock.h"
 #include "sys/etimer.h"
 #include "rtimer-arch.h"
+#include "watchdog.h"
 
 #define INTERVAL (RTIMER_ARCH_SECOND / CLOCK_SECOND)