diff --git a/pkgs/development/libraries/libunistring/default.nix b/pkgs/development/libraries/libunistring/default.nix
index f768434fce4b..f36e1554636c 100644
--- a/pkgs/development/libraries/libunistring/default.nix
+++ b/pkgs/development/libraries/libunistring/default.nix
@@ -1,42 +1,52 @@
-{ fetchurl, lib, stdenv, libiconv, updateAutotoolsGnuConfigScriptsHook }:
+{
+  fetchurl,
+  lib,
+  stdenv,
+  libiconv,
+  updateAutotoolsGnuConfigScriptsHook,
+}:
 
 # Note: this package is used for bootstrapping fetchurl, and thus
 # cannot use fetchpatch! All mutable patches (generated by GitHub or
 # cgit) that are needed here should be included directly in Nixpkgs as
 # files.
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "libunistring";
   version = "1.2";
 
   src = fetchurl {
-    url = "mirror://gnu/libunistring/${pname}-${version}.tar.gz";
-    sha256 = "sha256-/W1WYvpwZIfEg0mnWLV7wUnOlOxsMGJOyf3Ec86rvI4=";
+    url = "mirror://gnu/libunistring/libunistring-${finalAttrs.version}.tar.gz";
+    hash = "sha256-/W1WYvpwZIfEg0mnWLV7wUnOlOxsMGJOyf3Ec86rvI4=";
   };
 
-  outputs = [ "out" "dev" "info" "doc" ];
+  outputs = [
+    "out"
+    "dev"
+    "info"
+    "doc"
+  ];
 
   strictDeps = true;
   propagatedBuildInputs = lib.optional (!stdenv.isLinux) libiconv;
   nativeBuildInputs = [ updateAutotoolsGnuConfigScriptsHook ];
 
-  configureFlags = [
-    "--with-libiconv-prefix=${libiconv}"
-  ];
+  configureFlags = [ "--with-libiconv-prefix=${libiconv}" ];
 
   doCheck = false;
 
-  /* This seems to cause several random failures like these, which I assume
-     is because of bad or missing target dependencies in their build system:
+  /*
+    This seems to cause several random failures like these, which I assume
+    is because of bad or missing target dependencies in their build system:
 
-        ./unistdio/test-u16-vasnprintf2.sh: line 16: ./test-u16-vasnprintf1: No such file or directory
-        FAIL unistdio/test-u16-vasnprintf2.sh (exit status: 1)
+      ./unistdio/test-u16-vasnprintf2.sh: line 16: ./test-u16-vasnprintf1: No such file or directory
+      FAIL unistdio/test-u16-vasnprintf2.sh (exit status: 1)
 
-        FAIL: unistdio/test-u16-vasnprintf3.sh
-        ======================================
+      FAIL: unistdio/test-u16-vasnprintf3.sh
+      ======================================
 
-        ./unistdio/test-u16-vasnprintf3.sh: line 16: ./test-u16-vasnprintf1: No such file or directory
-        FAIL unistdio/test-u16-vasnprintf3.sh (exit status: 1)
+      ./unistdio/test-u16-vasnprintf3.sh: line 16: ./test-u16-vasnprintf1: No such file or directory
+      FAIL unistdio/test-u16-vasnprintf3.sh (exit status: 1)
   */
   enableParallelChecking = false;
   enableParallelBuilding = true;
@@ -72,4 +82,4 @@ stdenv.mkDerivation rec {
     maintainers = [ ];
     platforms = lib.platforms.all;
   };
-}
+})