diff --git a/lib/hx509/ks_dir.c b/lib/hx509/ks_dir.c
index a627fc65a..cffa00728 100644
--- a/lib/hx509/ks_dir.c
+++ b/lib/hx509/ks_dir.c
@@ -93,7 +93,9 @@ dir_free(hx509_certs certs, void *data)
     return 0;
 }
 
-
+#ifdef SunOS
+#define dirfd(x) ((x)->dd_fd)
+#endif
 
 static int
 dir_iter_start(hx509_context context,