diff --git a/pkgs/development/libraries/haskell/errorcall-eq-instance/default.nix b/pkgs/development/libraries/haskell/errorcall-eq-instance/default.nix
new file mode 100644
index 000000000000..e3bfa5c569ea
--- /dev/null
+++ b/pkgs/development/libraries/haskell/errorcall-eq-instance/default.nix
@@ -0,0 +1,13 @@
+{ cabal, hspec, QuickCheck }:
+
+cabal.mkDerivation (self: {
+  pname = "errorcall-eq-instance";
+  version = "0.1.0";
+  sha256 = "1sr2wxbdqzpdawcivvd01nwpki0xbcxylz5qv95b96sq6b296gkk";
+  testDepends = [ hspec QuickCheck ];
+  meta = {
+    description = "An orphan Eq instance for ErrorCall";
+    license = self.stdenv.lib.licenses.mit;
+    platforms = self.ghc.meta.platforms;
+  };
+})
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 87b99ddf5d98..af706d027745 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -966,6 +966,8 @@ let result = let callPackage = x : y : modifyPrio (newScope result.finalReturn x
 
   erf = callPackage ../development/libraries/haskell/erf {};
 
+  errorcallEqInstance = callPackage ../development/libraries/haskell/errorcall-eq-instance {};
+
   errors = callPackage ../development/libraries/haskell/errors {};
 
   either = callPackage ../development/libraries/haskell/either {};