diff --git a/libc/include/sys/xattr.h b/libc/include/sys/xattr.h
index 7e437e9..37e352d 100644
--- a/libc/include/sys/xattr.h
+++ b/libc/include/sys/xattr.h
@@ -30,6 +30,7 @@
 #define _SYS_XATTR_H_
 
 #include <linux/xattr.h>
+#include <sys/cdefs.h>
 #include <sys/types.h>
 
 __BEGIN_DECLS