diff --git a/src/http/request/form-decoding.capability.ts b/src/http/request/form-decoding.capability.ts
index 6cb51ac..420db1e 100644
--- a/src/http/request/form-decoding.capability.ts
+++ b/src/http/request/form-decoding.capability.ts
@@ -55,10 +55,11 @@ class FormDecodingCapability<TInput extends HttpMeans, TBody>
   extends RequestCapability<TInput, RequestBodyMeans<TBody>>
   implements FormDecoding<TInput, TBody> {
 
-  constructor(
-    private readonly _transform: RequestValueTransformer<TInput, URLSearchParams, TBody>,
-  ) {
+  readonly #transform: RequestValueTransformer<TInput, URLSearchParams, TBody>;
+
+  constructor(transform: RequestValueTransformer<TInput, URLSearchParams, TBody>) {
     super();
+    this.#transform = transform;
   }
 
   for<TMeans extends TInput>(
@@ -79,7 +80,7 @@ class FormDecodingCapability<TInput extends HttpMeans, TBody>
       return context.next(
         handler,
         requestExtension<TMeans, RequestBodyMeans<TBody>>({
-          requestBody: await this._transform(params, context as RequestContext<TInput>),
+          requestBody: await this.#transform(params, context as RequestContext<TInput>),
         }),
       );
     };
diff --git a/src/http/request/http-forwarding.capability.ts b/src/http/request/http-forwarding.capability.ts
index 88197ee..bf77f2f 100644
--- a/src/http/request/http-forwarding.capability.ts
+++ b/src/http/request/http-forwarding.capability.ts
@@ -28,13 +28,16 @@ export interface HttpForwarding extends RequestCapability<HttpMeans> {
  */
 class HttpForwardingCapability extends RequestCapability<HttpMeans> implements HttpForwarding {
 
-  constructor(private readonly _trust: HttpForwardTrust) {
+  readonly #trust: HttpForwardTrust;
+
+  constructor(trust: HttpForwardTrust) {
     super();
+    this.#trust = trust;
   }
 
   for<TMeans extends HttpMeans>(handler: RequestHandler<TMeans & object>): RequestHandler<TMeans> {
     return ({ request, next }) => {
-      const addresses = lazyValue(() => HttpAddressRep.by(request, this._trust));
+      const addresses = lazyValue(() => HttpAddressRep.by(request, this.#trust));
 
       return next(
         handler,
diff --git a/src/http/request/json-parsing.capability.ts b/src/http/request/json-parsing.capability.ts
index 1da7795..c16bb23 100644
--- a/src/http/request/json-parsing.capability.ts
+++ b/src/http/request/json-parsing.capability.ts
@@ -57,8 +57,11 @@ class JsonParsingCapability<TInput extends HttpMeans, TBody>
   extends RequestCapability<TInput, RequestBodyMeans<TBody>>
   implements JsonParsing<TInput, TBody> {
 
-  constructor(private readonly _transform: RequestValueTransformer<TInput, any, TBody>) {
+  readonly #transform: RequestValueTransformer<TInput, any, TBody>;
+
+  constructor(transform: RequestValueTransformer<TInput, any, TBody>) {
     super();
+    this.#transform = transform;
   }
 
   for<TMeans extends TInput>(
@@ -84,7 +87,7 @@ class JsonParsingCapability<TInput extends HttpMeans, TBody>
       return next(
         handler,
         requestExtension<TMeans, RequestBodyMeans<TBody>>({
-          requestBody: await this._transform(json, context as RequestContext<TInput>),
+          requestBody: await this.#transform(json, context as RequestContext<TInput>),
         }),
       );
     };
diff --git a/src/testing/test-http-server.ts b/src/testing/test-http-server.ts
index 8ffa66c..b315adf 100644
--- a/src/testing/test-http-server.ts
+++ b/src/testing/test-http-server.ts
@@ -24,35 +24,35 @@ export class TestHttpServer {
    * @returns A promise resolved to started server.
    */
   static start(): Promise<TestHttpServer> {
-    return new TestHttpServer()._start();
+    return new TestHttpServer().#start();
   }
 
   /**
    * @internal
    */
-  private _listener: RequestListener;
+  #listener: RequestListener;
 
   /**
    * @internal
    */
-  private _server!: Server;
+  #server!: Server;
 
   private constructor() {
-    this._listener = noop;
+    this.#listener = noop;
   }
 
   /**
    * HTTP server instance.
    */
   get server(): Server {
-    return this._server;
+    return this.#server;
   }
 
   /**
    * An address the service is bound to.
    */
   get address(): AddressInfo {
-    return this._server.address() as AddressInfo;
+    return this.#server.address() as AddressInfo;
   }
 
   /**
@@ -63,7 +63,7 @@ export class TestHttpServer {
    * @returns `this` instance.
    */
   listenBy(listener: RequestListener): this {
-    this._listener = listener;
+    this.#listener = listener;
 
     return this;
   }
@@ -113,9 +113,9 @@ export class TestHttpServer {
   /**
    * @internal
    */
-  private _start(): Promise<TestHttpServer> {
+  #start(): Promise<TestHttpServer> {
     return new Promise((resolve, reject) => {
-      const server = (this._server = createServer((request, response) => this._listener(request, response)));
+      const server = (this.#server = createServer((request, response) => this.#listener(request, response)));
 
       server.on('error', reject);
       server.on('listening', () => resolve(this));