diff --git a/pkgs/development/ocaml-modules/npy/default.nix b/pkgs/development/ocaml-modules/npy/default.nix
index 763f159a20c3..b70b44363989 100644
--- a/pkgs/development/ocaml-modules/npy/default.nix
+++ b/pkgs/development/ocaml-modules/npy/default.nix
@@ -6,7 +6,7 @@
   camlzip,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "npy";
   version = "0.0.9";
 
@@ -16,8 +16,8 @@ buildDunePackage rec {
 
   src = fetchFromGitHub {
     owner = "LaurentMazare";
-    repo = "${pname}-ocaml";
-    rev = version;
+    repo = "npy-ocaml";
+    rev = finalAttrs.version;
     hash = "sha256:1fryglkm20h6kdqjl55b7065b34bdg3g3p6j0jv33zvd1m5888m1";
   };
 
@@ -27,9 +27,9 @@ buildDunePackage rec {
   doCheck = true;
 
   meta = {
-    inherit (src.meta) homepage;
+    inherit (finalAttrs.src.meta) homepage;
     description = "OCaml implementation of the Npy format spec";
     maintainers = [ lib.maintainers.bcdarwin ];
     license = lib.licenses.asl20;
   };
-}
+})