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-rw-r--r--pkgs/top-level/haskell-packages.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 99cb3351515f..cbeeb3b089f9 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -1005,7 +1005,7 @@ let result = let callPackage = x : y : modifyPrio (newScope result.finalReturn x
 
   eventList = callPackage ../development/libraries/haskell/event-list {};
 
-  exPool = callPackage ../development/libraries/haskell/ex-pool { hashable = self.hashable_1_2_1_0; };
+  exPool = callPackage ../development/libraries/haskell/ex-pool { };
 
   exceptionMtl = callPackage ../development/libraries/haskell/exception-mtl {};