diff --git a/pkgs/development/libraries/haskell/math-functions/default.nix b/pkgs/development/libraries/haskell/math-functions/default.nix
index a7a9d92fb978..b14449626c87 100644
--- a/pkgs/development/libraries/haskell/math-functions/default.nix
+++ b/pkgs/development/libraries/haskell/math-functions/default.nix
@@ -12,7 +12,6 @@ cabal.mkDerivation (self: {
     HUnit ieee754 QuickCheck testFramework testFrameworkHunit
     testFrameworkQuickcheck2 vector
   ];
-  # fails on i686 at version 0.1.5.2
   doCheck = false;
   meta = {
     homepage = "https://github.com/bos/math-functions";
diff --git a/pkgs/development/libraries/haskell/mime-mail/default.nix b/pkgs/development/libraries/haskell/mime-mail/default.nix
index 7ba509761687..e2559c70fee7 100644
--- a/pkgs/development/libraries/haskell/mime-mail/default.nix
+++ b/pkgs/development/libraries/haskell/mime-mail/default.nix
@@ -1,5 +1,5 @@
 { cabal, base64Bytestring, blazeBuilder, filepath, hspec, random
-, text, sendmail ? "sendmail"
+, sendmail ? "sendmail", text
 }:
 
 cabal.mkDerivation (self: {
@@ -10,7 +10,7 @@ cabal.mkDerivation (self: {
     base64Bytestring blazeBuilder filepath random text
   ];
   testDepends = [ blazeBuilder hspec text ];
-  configureFlags = [ "--ghc-option=-DMIME_MAIL_SENDMAIL_PATH=\"${sendmail}\"" ];
+  configureFlags = "--ghc-option=-DMIME_MAIL_SENDMAIL_PATH=\"${sendmail}\"";
   meta = {
     homepage = "http://github.com/snoyberg/mime-mail";
     description = "Compose MIME email messages";
diff --git a/pkgs/development/libraries/haskell/twitter-types/default.nix b/pkgs/development/libraries/haskell/twitter-types/default.nix
index 299d39c45469..a7fb544afc1f 100644
--- a/pkgs/development/libraries/haskell/twitter-types/default.nix
+++ b/pkgs/development/libraries/haskell/twitter-types/default.nix
@@ -12,6 +12,7 @@ cabal.mkDerivation (self: {
     aeson attoparsec httpTypes HUnit shakespeareText testFramework
     testFrameworkHunit testFrameworkThPrime text unorderedContainers
   ];
+  doCheck = false;
   meta = {
     homepage = "https://github.com/himura/twitter-types";
     description = "Twitter JSON parser and types";
@@ -19,5 +20,4 @@ cabal.mkDerivation (self: {
     platforms = self.ghc.meta.platforms;
     maintainers = [ self.stdenv.lib.maintainers.ocharles ];
   };
-  doCheck = false;
 })