diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 9c18b96e50fc..8f55ecae418d 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -2751,7 +2751,7 @@ self : let callPackage = x : y : modifyPrio (newScope self x y); in
 
   unboundedDelays = callPackage ../development/libraries/haskell/unbounded-delays {};
 
-  unificationFd = callPackage ../development/libraries/haskell/unification-fd {};  
+  unificationFd = callPackage ../development/libraries/haskell/unification-fd {};
 
   unionFind = callPackage ../development/libraries/haskell/union-find {};