diff --git a/pkgs/development/coq-modules/coinduction/default.nix b/pkgs/development/coq-modules/coinduction/default.nix
index 2b6f52e7ae91..40f81095f00d 100644
--- a/pkgs/development/coq-modules/coinduction/default.nix
+++ b/pkgs/development/coq-modules/coinduction/default.nix
@@ -21,7 +21,7 @@ mkCoqDerivation {
       }
     ] null;
   release = {
-    "1.9".sha256 = "sha256-bBU+xDklnzJBeN41GarW5KXzD8eKsOYtb//ULYumwWE=";
+    "1.9".hash = "sha256-bBU+xDklnzJBeN41GarW5KXzD8eKsOYtb//ULYumwWE=";
   };
   releaseRev = v: "v${v}";