diff --git a/pkgs/tools/networking/openapi-generator-cli/default.nix b/pkgs/tools/networking/openapi-generator-cli/default.nix
index 2edba9a26eb6..e9572bf45960 100644
--- a/pkgs/tools/networking/openapi-generator-cli/default.nix
+++ b/pkgs/tools/networking/openapi-generator-cli/default.nix
@@ -1,17 +1,17 @@
 { callPackage, lib, stdenv, fetchurl, jre, makeWrapper }:
 
-let this = stdenv.mkDerivation rec {
+let this = stdenv.mkDerivation (finalAttrs: {
   version = "7.2.0";
   pname = "openapi-generator-cli";
 
-  jarfilename = "${pname}-${version}.jar";
+  jarfilename = "${finalAttrs.pname}-${finalAttrs.version}.jar";
 
   nativeBuildInputs = [
     makeWrapper
   ];
 
   src = fetchurl {
-    url = "mirror://maven/org/openapitools/${pname}/${version}/${jarfilename}";
+    url = "mirror://maven/org/openapitools/${finalAttrs.pname}/${finalAttrs.version}/${finalAttrs.jarfilename}";
     sha256 = "sha256-HPDIDeEsD9yFlCicGeQUtAIQjvELjdC/2hlTFRNBq10=";
   };
 
@@ -20,10 +20,10 @@ let this = stdenv.mkDerivation rec {
   installPhase = ''
     runHook preInstall
 
-    install -D "$src" "$out/share/java/${jarfilename}"
+    install -D "$src" "$out/share/java/${finalAttrs.jarfilename}"
 
-    makeWrapper ${jre}/bin/java $out/bin/${pname} \
-      --add-flags "-jar $out/share/java/${jarfilename}"
+    makeWrapper ${jre}/bin/java $out/bin/${finalAttrs.pname} \
+      --add-flags "-jar $out/share/java/${finalAttrs.jarfilename}"
 
     runHook postInstall
   '';
@@ -31,14 +31,15 @@ let this = stdenv.mkDerivation rec {
   meta = with lib; {
     description = "Allows generation of API client libraries (SDK generation), server stubs and documentation automatically given an OpenAPI Spec";
     homepage = "https://github.com/OpenAPITools/openapi-generator";
-    changelog = "https://github.com/OpenAPITools/openapi-generator/releases/tag/v${version}";
+    changelog = "https://github.com/OpenAPITools/openapi-generator/releases/tag/v${finalAttrs.version}";
     sourceProvenance = with sourceTypes; [ binaryBytecode ];
     license = licenses.asl20;
     maintainers = with maintainers; [ shou ];
+    mainProgram = "openapi-generator-cli";
   };
 
   passthru.tests.example = callPackage ./example.nix {
     openapi-generator-cli = this;
   };
-};
+});
 in this