diff --git a/cabal-install/Distribution/Client/Dependency.hs b/cabal-install/Distribution/Client/Dependency.hs
index 6da12f01cb7..a779daaedf0 100644
--- a/cabal-install/Distribution/Client/Dependency.hs
+++ b/cabal-install/Distribution/Client/Dependency.hs
@@ -721,7 +721,7 @@ resolveDependencies platform comp pkgConfigDB solver params =
                      pkgConfigDB preferences constraints targets
   where
 
-    finalparams @ (DepResolverParams
+    finalparams@(DepResolverParams
       targets constraints
       prefs defpref
       installedPkgIndex
diff --git a/cabal-install/Distribution/Client/Sandbox.hs b/cabal-install/Distribution/Client/Sandbox.hs
index ab1412c5d29..df672aa1b8f 100644
--- a/cabal-install/Distribution/Client/Sandbox.hs
+++ b/cabal-install/Distribution/Client/Sandbox.hs
@@ -1,5 +1,6 @@
 {-# LANGUAGE CPP #-}
 {-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE RankNTypes #-}
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  Distribution.Client.Sandbox