diff --git a/src/tests_test.c b/src/tests_test.c
index 3f8a65513..79cc3224c 100644
--- a/src/tests_test.c
+++ b/src/tests_test.c
@@ -1,3 +1,4 @@
+#include <util/language.h>
 #include <kernel/item.h>
 #include <kernel/region.h>