diff --git a/libc/stdio/stdio.cpp b/libc/stdio/stdio.cpp
index b8aced8..c7b1ba4 100644
--- a/libc/stdio/stdio.cpp
+++ b/libc/stdio/stdio.cpp
@@ -57,8 +57,7 @@
 #include "private/ErrnoRestorer.h"
 #include "private/thread_private.h"
 
-#define ALIGNBYTES (sizeof(uintptr_t) - 1)
-#define ALIGN(p) (((uintptr_t)(p) + ALIGNBYTES) &~ ALIGNBYTES)
+#include "private/bsd_sys_param.h" // For ALIGN/ALIGNBYTES.
 
 #define	NDYNAMIC 10		/* add ten more whenever necessary */