diff --git a/pkgs/development/ocaml-modules/psq/default.nix b/pkgs/development/ocaml-modules/psq/default.nix
index e2349aed828a..e10af60b1d5d 100644
--- a/pkgs/development/ocaml-modules/psq/default.nix
+++ b/pkgs/development/ocaml-modules/psq/default.nix
@@ -7,7 +7,7 @@
   qcheck-alcotest,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   minimalOCamlVersion = "4.03";
   pname = "psq";
   version = "0.2.1";
@@ -15,7 +15,7 @@ buildDunePackage rec {
   duneVersion = "3";
 
   src = fetchurl {
-    url = "https://github.com/pqwy/psq/releases/download/v${version}/psq-${version}.tbz";
+    url = "https://github.com/pqwy/psq/releases/download/v${finalAttrs.version}/psq-${finalAttrs.version}.tbz";
     hash = "sha256-QgBfUz6r50sXme4yuJBWVM1moivtSvK9Jmso2EYs00Q=";
   };
 
@@ -30,4 +30,4 @@ buildDunePackage rec {
     maintainers = [ lib.maintainers.vbgl ];
     license = lib.licenses.isc;
   };
-}
+})