diff --git a/pkgs/by-name/po/postgrey/package.nix b/pkgs/by-name/po/postgrey/package.nix
index 44b5e6ed32f4..df7e770ce002 100644
--- a/pkgs/by-name/po/postgrey/package.nix
+++ b/pkgs/by-name/po/postgrey/package.nix
@@ -25,13 +25,14 @@ let
       ParseSyslog
     ]
   );
+  pname = "postgrey";
   version = "1.37";
-  name = "postgrey-${version}";
 in
-runCommand name
+runCommand "${pname}-${version}"
   {
+    inherit pname version;
     src = fetchurl {
-      url = "https://postgrey.schweikert.ch/pub/${name}.tar.gz";
+      url = "https://postgrey.schweikert.ch/pub/${pname}-${version}.tar.gz";
       sha256 = "1xx51xih4711vrvc6d57il9ccallbljj5zhgqdb07jzmz11rakgz";
     };
     meta = {