diff --git a/pkgs/by-name/mk/mkjson/generated.nix b/pkgs/by-name/mk/mkjson/generated.nix
index 1fd4090b1d0f..c24b89585a0f 100644
--- a/pkgs/by-name/mk/mkjson/generated.nix
+++ b/pkgs/by-name/mk/mkjson/generated.nix
@@ -1,7 +1,7 @@
 {
   mkDerivation,
   lib,
-  fetchFromGitHub,
+  fetchFromCodeberg,
   aeson,
   base,
   bytestring,
@@ -26,7 +26,7 @@
 mkDerivation rec {
   pname = "mkjson";
   version = "0.4.0";
-  src = fetchFromGitHub {
+  src = fetchFromCodeberg {
     owner = "mfussenegger";
     repo = "mkjson";
     rev = "${version}";
diff --git a/pkgs/by-name/mk/mkjson/package.nix b/pkgs/by-name/mk/mkjson/package.nix
index 09e4b73886a2..dbfd56a7c699 100644
--- a/pkgs/by-name/mk/mkjson/package.nix
+++ b/pkgs/by-name/mk/mkjson/package.nix
@@ -1,2 +1,19 @@
-{ haskell, haskellPackages }:
-haskell.lib.justStaticExecutables (haskellPackages.callPackage ./generated.nix { })
+{
+  haskell,
+  haskellPackages,
+  lib,
+}:
+let
+  inherit (haskell.lib.compose) justStaticExecutables overrideCabal;
+
+  # The mkjson-doctest suite depends on specific RNG results not provided by the
+  # GHC in Nixpkgs as of this writing.
+  overrides = {
+    testTargets = [ "mkjson-test" ];
+  };
+  raw-pkg = haskellPackages.callPackage ./generated.nix { };
+in
+lib.pipe raw-pkg [
+  (overrideCabal overrides)
+  justStaticExecutables
+]