diff --git a/pkgs/development/coq-modules/coq-haskell/default.nix b/pkgs/development/coq-modules/coq-haskell/default.nix
index 32522e8ef3a1..0a70405ea6d4 100644
--- a/pkgs/development/coq-modules/coq-haskell/default.nix
+++ b/pkgs/development/coq-modules/coq-haskell/default.nix
@@ -13,7 +13,7 @@ mkCoqDerivation {
   inherit version;
   defaultVersion = if lib.versions.range "8.5" "8.8" coq.coq-version then "20171215" else null;
   release."20171215".rev = "e2cf8b270c2efa3b56fab1ef6acc376c2c3de968";
-  release."20171215".sha256 = "09dq1vvshhlhgjccrhqgbhnq2hrys15xryfszqq11rzpgvl2zgdv";
+  release."20171215".hash = "sha256:09dq1vvshhlhgjccrhqgbhnq2hrys15xryfszqq11rzpgvl2zgdv";
 
   mlPlugin = true;
   extraInstallFlags = [ "-f Makefile.coq" ];