diff --git a/sortix/include/sortix/display.h b/sortix/include/sortix/display.h
index 5828b64d..9db62ef9 100644
--- a/sortix/include/sortix/display.h
+++ b/sortix/include/sortix/display.h
@@ -27,6 +27,7 @@
 
 #include <sys/cdefs.h>
 
+#include <stddef.h>
 #include <stdint.h>
 
 __BEGIN_DECLS