diff --git a/libc/include/fts.h b/libc/include/fts.h
index cde0349..b46c19c 100644
--- a/libc/include/fts.h
+++ b/libc/include/fts.h
@@ -35,6 +35,7 @@
 #ifndef	_FTS_H_
 #define	_FTS_H_
 
+#include <sys/cdefs.h>
 #include <sys/types.h>
 
 typedef struct {