1 files changed, 1 insertions, 0 deletions
diff --git a/obs.ipkg b/obs.ipkg
index b6906d5..73ffaf9 100644
--- a/obs.ipkg
+++ b/obs.ipkg
@@ -9,6 +9,7 @@ options = "--total"
 modules
   = Core.Context
   , Core.Declarative
+  , Core.Declarative.Substitution
   , Core.Environment
   , Core.Name
   , Core.Reduction