diff --git a/pkgs/development/coq-modules/Velisarios/default.nix b/pkgs/development/coq-modules/Velisarios/default.nix
index 2dc81cb7ad59..46692840e6e9 100644
--- a/pkgs/development/coq-modules/Velisarios/default.nix
+++ b/pkgs/development/coq-modules/Velisarios/default.nix
@@ -12,7 +12,7 @@ mkCoqDerivation {
   defaultVersion = if lib.versions.range "8.6" "8.8" coq.coq-version then "20180221" else null;
 
   release."20180221".rev = "e1eee1f10d5d46331a560bd8565ac101229d0d6b";
-  release."20180221".sha256 = "0l9885nxy0n955fj1gnijlxl55lyxiv9yjfmz8hmfrn9hl8vv1m2";
+  release."20180221".hash = "sha256:0l9885nxy0n955fj1gnijlxl55lyxiv9yjfmz8hmfrn9hl8vv1m2";
   mlPlugin = true;
 
   buildPhase = "make -j$NIX_BUILD_CORES";