diff --git a/extra/io/windows/files/files.factor b/extra/io/windows/files/files.factor
index b4513f7da8..655b5f9daf 100755
--- a/extra/io/windows/files/files.factor
+++ b/extra/io/windows/files/files.factor
@@ -1,6 +1,6 @@
 ! Copyright (C) 2008 Doug Coleman.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: alien.c-types io.files io.windows kernel
+USING: alien.c-types io.backend io.files io.windows kernel
 math windows windows.kernel32 combinators.cleave
 windows.time calendar combinators math.functions
 sequences namespaces words symbols ;