diff --git a/basis/io/directories/unix/linux/linux.factor b/basis/io/directories/unix/linux/linux.factor
index c5678fae9c..932cbe230b 100644
--- a/basis/io/directories/unix/linux/linux.factor
+++ b/basis/io/directories/unix/linux/linux.factor
@@ -1,7 +1,7 @@
 ! Copyright (C) 2009 Doug Coleman.
 ! See http://factorcode.org/license.txt for BSD license.
 USING: alien.c-types io.directories.unix kernel system unix
-classes.struct ;
+classes.struct unix.ffi ;
 IN: io.directories.unix.linux
 
 M: unix find-next-file ( DIR* -- dirent )