diff --git a/headers/posix/fcntl.h b/headers/posix/fcntl.h
index 30cd8fb483..ba0baeb6ab 100644
--- a/headers/posix/fcntl.h
+++ b/headers/posix/fcntl.h
@@ -59,7 +59,7 @@
 #define O_DIRECTORY		0x00200000	/* fail if not a directory */
 
 /* flags for the *at() functions */
-#define AT_FDCWD		(-1)		/* CWD FD for the *at() functions */
+#define AT_FDCWD		(-100)		/* CWD FD for the *at() functions */
 
 #define AT_SYMLINK_NOFOLLOW	0x01	/* fstatat(), fchmodat(), fchownat(),
 										utimensat() */