diff --git a/pkgs/development/tools/haskell/hdevtools/default.nix b/pkgs/development/tools/haskell/hdevtools/default.nix
index 350ad216bca..8f1397775b7 100644
--- a/pkgs/development/tools/haskell/hdevtools/default.nix
+++ b/pkgs/development/tools/haskell/hdevtools/default.nix
@@ -6,7 +6,7 @@ cabal.mkDerivation (self: {
   sha256 = "1a218m817q35f52fv6mn28sfv136i6fm2mzgdidpm24pc0585gl7";
   isLibrary = false;
   isExecutable = true;
-  patches = [ (fetchurl { url = "https://github.com/ts468/hdevtools/pull/2.patch"; md5 = "256609d2d3f5b719caa0002ee579d169"; }) ];
+  patches = [ (fetchurl { url = "https://github.com/ts468/hdevtools/pull/2.patch"; sha256 = "104vdw6qxl71fdg43ppv0hrg6k17zaijq73vap794178d3gb35al"; }) ];
   buildDepends = [ cmdargs ghcPaths network syb time ];
   meta = {
     homepage = "https://github.com/bitc/hdevtools/";