diff --git a/extra/mason/child/child-tests.factor b/extra/mason/child/child-tests.factor
index a83e7282da..2d5a7c6635 100644
--- a/extra/mason/child/child-tests.factor
+++ b/extra/mason/child/child-tests.factor
@@ -1,5 +1,5 @@
 IN: mason.child.tests
-USING: mason.child mason.config tools.test namespaces ;
+USING: mason.child mason.config tools.test namespaces io kernel sequences ;
 
 [ { "make" "winnt-x86-32" } ] [
     [