diff --git a/kernel/include/sortix/itimerspec.h b/kernel/include/sortix/itimerspec.h
index 0be029b7..f7cfaf9a 100644
--- a/kernel/include/sortix/itimerspec.h
+++ b/kernel/include/sortix/itimerspec.h
@@ -27,6 +27,8 @@
 
 #include <sys/cdefs.h>
 
+#include <sortix/timespec.h>
+
 __BEGIN_DECLS
 
 struct itimerspec