diff --git a/pkgs/development/libraries/haskell/midi/default.nix b/pkgs/development/libraries/haskell/midi/default.nix
index 9467b567f82..71593bd21cd 100644
--- a/pkgs/development/libraries/haskell/midi/default.nix
+++ b/pkgs/development/libraries/haskell/midi/default.nix
@@ -4,14 +4,16 @@
 
 cabal.mkDerivation (self: {
   pname = "midi";
-  version = "0.2.1.1";
-  sha256 = "11h4kr9a1jia1ghcyzgavcznw4771l00z736iibjpagw0b8fpip5";
-  isLibrary = true;
-  isExecutable = true;
+  version = "0.2.1.2";
+  sha256 = "077cxdazr97hjpq42l7hjn905pfhyshvaiwqjdfnzhjv6r48q4zk";
   buildDepends = [
     binary eventList explicitException monoidTransformer nonNegative
     QuickCheck random transformers utilityHt
   ];
+  testDepends = [
+    eventList explicitException nonNegative QuickCheck transformers
+    utilityHt
+  ];
   meta = {
     homepage = "http://www.haskell.org/haskellwiki/MIDI";
     description = "Handling of MIDI messages and files";