diff --git a/src/Control/Abstract/Primitive.hs b/src/Control/Abstract/Primitive.hs
index 8fd052f03..bd7ddb81c 100644
--- a/src/Control/Abstract/Primitive.hs
+++ b/src/Control/Abstract/Primitive.hs
@@ -6,6 +6,7 @@ module Control.Abstract.Primitive
   , builtInPrint
   , builtInExport
   , lambda
+  , Lambda(..)
   ) where
 
 import Control.Abstract.Context