diff --git a/basis/io/files/unique/unique-tests.factor b/basis/io/files/unique/unique-tests.factor
index 9fa9708e7b..fd8cf2c69f 100644
--- a/basis/io/files/unique/unique-tests.factor
+++ b/basis/io/files/unique/unique-tests.factor
@@ -1,6 +1,6 @@
 USING: io.encodings.ascii sequences strings io io.files accessors
 tools.test kernel io.files.unique namespaces continuations
-io.files.info io.pathnames ;
+io.files.info io.pathnames io.directories ;
 IN: io.files.unique.tests
 
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