diff --git a/integration/microservices/e2e/sum-grpc.spec.ts b/integration/microservices/e2e/sum-grpc.spec.ts
index d292c3c2100..cc4dbe45a14 100644
--- a/integration/microservices/e2e/sum-grpc.spec.ts
+++ b/integration/microservices/e2e/sum-grpc.spec.ts
@@ -48,11 +48,16 @@ describe('GRPC transport', () => {
     );
   });
 
-  it(`GRPC Sending and Receiving HTTP POST`, () => {
-    return request(server)
+  it(`GRPC Sending and Receiving HTTP POST`, async () => {
+    await request(server)
       .post('/sum')
       .send([1, 2, 3, 4, 5])
       .expect(200, { result: 15 });
+
+    await request(server)
+      .post('/upperMethod/sum')
+      .send([1, 2, 3, 4, 5])
+      .expect(200, { result: 15 });
   });
 
   it(`GRPC Sending and Receiving HTTP POST (multiple proto)`, async () => {
diff --git a/integration/microservices/src/grpc/grpc.controller.ts b/integration/microservices/src/grpc/grpc.controller.ts
index e99d8d6c632..94b7c4f75d3 100644
--- a/integration/microservices/src/grpc/grpc.controller.ts
+++ b/integration/microservices/src/grpc/grpc.controller.ts
@@ -40,6 +40,14 @@ export class GrpcController {
     return svc.sum({ data });
   }
 
+  // Test that getService generate both lower and uppercase method
+  @Post('upperMethod/sum')
+  @HttpCode(200)
+  callWithOptions(@Body() data: number[]): Observable<number> {
+    const svc = this.client.getService<any>('Math');
+    return svc.Sum({ data });
+  }
+
   @GrpcMethod('Math')
   async sum({ data }: { data: number[] }): Promise<any> {
     return of({
diff --git a/packages/microservices/client/client-grpc.ts b/packages/microservices/client/client-grpc.ts
index 298a9e1524c..008bee4fa83 100644
--- a/packages/microservices/client/client-grpc.ts
+++ b/packages/microservices/client/client-grpc.ts
@@ -53,8 +53,7 @@ export class ClientGrpcProxy extends ClientProxy implements ClientGrpc {
     const grpcService = {} as T;
 
     protoMethods.forEach(m => {
-      const key = m[0].toLowerCase() + m.slice(1, m.length);
-      grpcService[key] = this.createServiceMethod(grpcClient, m);
+      grpcService[m] = this.createServiceMethod(grpcClient, m);
     });
     return grpcService;
   }