diff --git a/stack-ghc7.10.yaml b/stack-ghc7.10.yaml
index e78f964b8..bcb4a4caa 100644
--- a/stack-ghc7.10.yaml
+++ b/stack-ghc7.10.yaml
@@ -29,6 +29,7 @@ extra-deps:
 - config-ini-0.2.2.0
 - criterion-1.4.1.0
 - data-clist-0.1.2.1
+- directory-1.2.7.0
 - exceptions-0.10.0
 - free-5.0.2
 - generics-sop-0.3.2.0