diff --git a/getcwd.c b/getcwd.c
index 503925f04..d210a6f3e 100644
--- a/getcwd.c
+++ b/getcwd.c
@@ -72,6 +72,10 @@
 
 #include "compat.h"
 
+#ifndef dirfd
+#  define dirfd(dirp)	((dirp)->dd_fd)
+#endif
+
 #define	ISDOT(dp) \
 	(dp->d_name[0] == '.' && (dp->d_name[1] == '\0' || \
 	    (dp->d_name[1] == '.' && dp->d_name[2] == '\0')))