diff --git a/libc/include/stdio.h b/libc/include/stdio.h
index d8515bcf..88e6f5fd 100644
--- a/libc/include/stdio.h
+++ b/libc/include/stdio.h
@@ -7,6 +7,9 @@
 #include <stdarg.h>
 #include <sys/types.h>
 
+#define __need_NULL
+#include <stddef.h>
+
 typedef struct
 {
     int _fd;