diff --git a/pkgs/by-name/rc/rcu/package.nix b/pkgs/by-name/rc/rcu/package.nix
index 26a30f2cac53..8ddb547e9aa0 100644
--- a/pkgs/by-name/rc/rcu/package.nix
+++ b/pkgs/by-name/rc/rcu/package.nix
@@ -22,7 +22,7 @@ python3Packages.buildPythonApplication rec {
   src = let
     src-tarball = requireFile {
       name = "rcu-d${version}-source.tar.gz";
-      sha256 = "15559537bjrviq5n87yz4q6n3y3l3bwip8rxg34zf0w9zmr4zmqn";
+      hash = "sha256-FtdPcv2JA/fJeD2jG/kadPhhDSbfH2QLjjvLdUZJpZQ=";
       url = "http://www.davisr.me/projects/rcu/";
     };
   in runCommand "${src-tarball.name}-unpacked" {} ''