diff --git a/tests/libfixmath/main.c b/tests/libfixmath/main.c
index bf775239a4..52f12f530c 100644
--- a/tests/libfixmath/main.c
+++ b/tests/libfixmath/main.c
@@ -30,6 +30,7 @@
 
 #include <stdio.h>
 
+#include "kernel_defines.h"
 #include "xtimer.h"
 #include "fix16.h"