diff --git a/src/Base.hs b/src/Base.hs
index 207d70c67..d9a5420e7 100644
--- a/src/Base.hs
+++ b/src/Base.hs
@@ -51,6 +51,7 @@ import GHC.Base as X (
   , ord
   , maxInt
   , minInt
+  , until
   )
 
 -- Exported for lifting into new functions.