diff --git a/pkgs/development/libraries/haskell/brainfuck/default.nix b/pkgs/development/libraries/haskell/brainfuck/default.nix
index 86a90f5d1b0..6501df58481 100644
--- a/pkgs/development/libraries/haskell/brainfuck/default.nix
+++ b/pkgs/development/libraries/haskell/brainfuck/default.nix
@@ -1,3 +1,5 @@
+{ cabal, mtl }:
+
 cabal.mkDerivation (self: {
   pname = "brainfuck";
   version = "0.1";
@@ -11,3 +13,4 @@ cabal.mkDerivation (self: {
     platforms = self.ghc.meta.platforms;
   };
 })
+
diff --git a/pkgs/development/libraries/haskell/default.nix b/pkgs/development/libraries/haskell/data-memocombinators/default.nix
similarity index 94%
rename from pkgs/development/libraries/haskell/default.nix
rename to pkgs/development/libraries/haskell/data-memocombinators/default.nix
index 1fb2118c363..d02cdab7110 100644
--- a/pkgs/development/libraries/haskell/default.nix
+++ b/pkgs/development/libraries/haskell/data-memocombinators/default.nix
@@ -1,3 +1,5 @@
+{ cabal, dataInttrie }:
+
 cabal.mkDerivation (self: {
   pname = "data-memocombinators";
   version = "0.4.3";
@@ -10,3 +12,4 @@ cabal.mkDerivation (self: {
     platforms = self.ghc.meta.platforms;
   };
 })
+
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index e6c01fa40f9..03eb341b699 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -473,7 +473,7 @@ let result = let callPackage = x : y : modifyPrio (newScope result.final x y);
 
   Boolean = callPackage ../development/libraries/haskell/Boolean {};
 
-  brainfuck = callPackage ../development/libraries/haskell/brainfuck/default.nix {};
+  brainfuck = callPackage ../development/libraries/haskell/brainfuck {};
 
   bson = callPackage ../development/libraries/haskell/bson {};
 
@@ -967,7 +967,7 @@ let result = let callPackage = x : y : modifyPrio (newScope result.final x y);
 
   languageHaskellExtract = callPackage ../development/libraries/haskell/language-haskell-extract {};
 
-  lambdabot = callPackage ../development/libraries/haskell/lambdabot/default.nix {};
+  lambdabot = callPackage ../development/libraries/haskell/lambdabot {};
 
   lambdabotUtils = callPackage ../development/libraries/haskell/lambdabot-utils {};