diff --git a/jest/jestEnvironment.js b/jest/jestEnvironment.js
index aeb87e8..d293d5d 100644
--- a/jest/jestEnvironment.js
+++ b/jest/jestEnvironment.js
@@ -1 +1 @@
-jest.requireActual('babel/polyfill');
+require.requireActual('babel/polyfill');
diff --git a/jest/setup.ts b/jest/setup.ts
index 65b2ff7..293e0ef 100644
--- a/jest/setup.ts
+++ b/jest/setup.ts
@@ -7,13 +7,14 @@ import { configure } from 'enzyme';
 import Adapter from 'enzyme-adapter-react-16';
 import { GlobalWithFetchMock } from 'jest-fetch-mock';
 
+// @ts-ignore : Only a void function can be called with the 'new' keyword
 configure({ adapter: new Adapter() });
 
 // @ts-ignore : Property '__APP_VERSION__' does not exist on type 'Global'.
 global.__APP_VERSION__ = '1.0.0';
 // @ts-ignore : Property '__VERDACCIO_BASENAME_UI_OPTIONS' does not exist on type 'Global'.
-global.__VERDACCIO_BASENAME_UI_OPTIONS = { base: 'http://localhost' };
-// @ts-ignore : Property 'VERDACCIO_API_URL' does not exist on type 'Global'.
+global.__VERDACCIO_BASENAME_UI_OPTIONS = {};
+
 global.VERDACCIO_API_URL = 'https://verdaccio.tld';
 
 const customGlobal: GlobalWithFetchMock = global as GlobalWithFetchMock;
diff --git a/src/utils/url.test.ts b/src/utils/url.test.ts
index b98fb82..34e42bd 100644
--- a/src/utils/url.test.ts
+++ b/src/utils/url.test.ts
@@ -17,18 +17,14 @@ describe('utils', () => {
       expect(isEmail('')).toBeFalsy();
     });
 
-    test('getRegistryURL() - should not change when location change', () => {
-      expect(getRegistryURL()).toBe('http://localhost');
+    test('getRegistryURL() - should keep slash if location is a sub directory', () => {
       history.pushState({}, 'page title', '/-/web/detail');
-      expect(getRegistryURL()).toBe('http://localhost');
+      expect(getRegistryURL()).toBe('http://localhost/-/web/detail');
       history.pushState({}, 'page title', '/');
     });
 
-    test('getRegistryURL() - should change when UI options change', () => {
+    test('getRegistryURL() - should not add slash if location is not a sub directory', () => {
       expect(getRegistryURL()).toBe('http://localhost');
-      window.__VERDACCIO_BASENAME_UI_OPTIONS.base = 'http://localhost/test';
-      expect(getRegistryURL()).toBe('http://localhost/test');
-      window.__VERDACCIO_BASENAME_UI_OPTIONS.base = 'http://localhost';
     });
   });
 
diff --git a/src/utils/url.ts b/src/utils/url.ts
index 021d034..41d2caf 100644
--- a/src/utils/url.ts
+++ b/src/utils/url.ts
@@ -15,7 +15,8 @@ export function isEmail(email: string): boolean {
 }
 
 export function getRegistryURL(): string {
-  return window.__VERDACCIO_BASENAME_UI_OPTIONS.base;
+  // Don't add slash if it's not a sub directory
+  return `${location.origin}${location.pathname === '/' ? '' : location.pathname}`;
 }
 
 export function extractFileName(url: string): string {