diff --git a/tests/vtimer_msg_diff/main.c b/tests/vtimer_msg_diff/main.c
index 59f530a5f..0cd42d6d0 100644
--- a/tests/vtimer_msg_diff/main.c
+++ b/tests/vtimer_msg_diff/main.c
@@ -23,6 +23,7 @@
 
 #include <stdio.h>
 #include <time.h>
+#include <inttypes.h>
 
 #include "vtimer.h"
 #include "thread.h"