diff --git a/pkgs/by-name/ja/jart-jsoncpp/package.nix b/pkgs/by-name/ja/jart-jsoncpp/package.nix
index 2af52e608153..1fbc4795a029 100644
--- a/pkgs/by-name/ja/jart-jsoncpp/package.nix
+++ b/pkgs/by-name/ja/jart-jsoncpp/package.nix
@@ -2,8 +2,6 @@
   stdenv,
   fetchFromGitHub,
   cmake,
-  copyPkgconfigItems,
-  makePkgconfigItem,
   lib,
   testers,
   ctestCheckHook,
@@ -15,10 +13,10 @@ stdenv.mkDerivation (finalAttrs: {
   version = "0-unstable-2025-10-25";
 
   src = fetchFromGitHub {
-    owner = "jart";
+    owner = "fzakaria";
     repo = "json.cpp";
-    rev = "6ec4e44a5bbaadbe677473378c3d2133644c58a1";
-    hash = "sha256-kUFtyFPoHGCFWTGRD8SoBsqHYCplGPw/AcpMR9T0Ffk=";
+    rev = "0a11e5c9e27d5edad72d28ec0d3214265bf8f009";
+    hash = "sha256-CPRZz6QZ7tsQoWgUCgTMmYbs35uR+I6R5As9MhhpUVw=";
   };
 
   doCheck = true;
@@ -31,7 +29,6 @@ stdenv.mkDerivation (finalAttrs: {
 
   nativeBuildInputs = [
     cmake
-    copyPkgconfigItems
     ctestCheckHook
     ninja
   ];
@@ -49,29 +46,6 @@ stdenv.mkDerivation (finalAttrs: {
     tests.pkg-config = testers.testMetaPkgConfig finalAttrs.finalPackage;
   };
 
-  # https://github.com/jart/json.cpp/issues/17
-  pkgconfigItems = [
-    (makePkgconfigItem rec {
-      name = "json.cpp";
-      inherit (finalAttrs) version;
-      cflags = [ "-I${variables.includedir}" ];
-      libs = [
-        "-L${variables.libdir}"
-        "-ljson"
-      ];
-      libsPrivate = [
-        # nixpkgs double-conversion does not support pkg-config
-        # as of yet.
-        "-ldouble-conversion"
-      ];
-      variables = {
-        includedir = "${placeholder "dev"}/include";
-        libdir = "${placeholder "out"}/lib";
-      };
-      inherit (finalAttrs.meta) description;
-    })
-  ];
-
   meta = {
     pkgConfigModules = [ "json.cpp" ];
     description = "JSON for Classic C++";

cat result-dev/lib/pkgconfig/json.cpp.pc
prefix=/nix/store/yxgymv2cq9j7wyddgrai6narglh37nrr-json.cpp-0-unstable-2025-10-25
libdir=/nix/store/yxgymv2cq9j7wyddgrai6narglh37nrr-json.cpp-0-unstable-2025-10-25/lib
includedir=/nix/store/xzvz4m1ngn4p21gqddwfm674h6kqx6r5-json.cpp-0-unstable-2025-10-25-dev/include

Name: json.cpp
Description: JSON for Classic C++
Version: 0.1.0
Libs: -L${libdir} -ljson
Cflags: -I${includedir}
Requires.private: double-conversion