diff --git a/extra/classes/singleton/singleton-tests.factor b/extra/classes/singleton/singleton-tests.factor
index 453a2a0ea5..08f4a77aad 100644
--- a/extra/classes/singleton/singleton-tests.factor
+++ b/extra/classes/singleton/singleton-tests.factor
@@ -1,4 +1,4 @@
-USING: kernel singleton tools.test prettyprint io.streams.string ;
+USING: kernel classes.singleton tools.test prettyprint io.streams.string ;
 IN: classes.singleton.tests
 
 [ ] [ SINGLETON: bzzt ] unit-test