diff --git a/pkgs/development/ocaml-modules/dtoa/default.nix b/pkgs/development/ocaml-modules/dtoa/default.nix
index 50d04572c5a1..6c5bdefeb851 100644
--- a/pkgs/development/ocaml-modules/dtoa/default.nix
+++ b/pkgs/development/ocaml-modules/dtoa/default.nix
@@ -7,12 +7,12 @@
   ounit2,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "dtoa";
   version = "0.3.3";
 
   src = fetchurl {
-    url = "https://github.com/flowtype/ocaml-${pname}/releases/download/v${version}/${pname}-${version}.tbz";
+    url = "https://github.com/flowtype/ocaml-dtoa/releases/download/v${finalAttrs.version}/dtoa-${finalAttrs.version}.tbz";
     hash = "sha256-2PRgjJ6Ssp4l6jHzv1/MqzlomQlJkKLVnRXG6KPJ7j4=";
   };
 
@@ -28,4 +28,4 @@ buildDunePackage rec {
     license = lib.licenses.mit;
     maintainers = [ lib.maintainers.eqyiel ];
   };
-}
+})