diff --git a/jest.config.ts b/jest.config.ts
index a8aff6104a..2d90bb82c5 100644
--- a/jest.config.ts
+++ b/jest.config.ts
@@ -25,10 +25,7 @@ const config: Config = {
     },
     testMatch: ["<rootDir>/test/**/*-test.[tj]s?(x)"],
     setupFiles: ["jest-canvas-mock"],
-    setupFilesAfterEnv: [
-        "<rootDir>/node_modules/matrix-react-sdk/test/setupTests.ts",
-        "<rootDir>/test/setup/setupLanguage.ts",
-    ],
+    setupFilesAfterEnv: ["<rootDir>/node_modules/matrix-react-sdk/test/setupTests.ts"],
     moduleNameMapper: {
         "\\.(css|scss|pcss)$": "<rootDir>/__mocks__/cssMock.js",
         "\\.(gif|png|ttf|woff2)$": "<rootDir>/node_modules/matrix-react-sdk/__mocks__/imageMock.js",
diff --git a/test/setup/setupLanguage.ts b/test/setup/setupLanguage.ts
index 8eead1cd3e..2dc4f0b048 100644
--- a/test/setup/setupLanguage.ts
+++ b/test/setup/setupLanguage.ts
@@ -25,6 +25,6 @@ fetchMock.config.overwriteRoutes = false;
 
 export function setupLanguageMock() {
     reactSetupLanguageMock();
-    fetchMock.get("end:en_EN.json", _.merge(en, reactEn), { overwriteRoutes: true });
+    fetchMock.get("end:en_EN.json", _.merge({}, en, reactEn), { overwriteRoutes: true });
 }
 setupLanguageMock();
diff --git a/test/unit-tests/async-components/structures/ErrorView-test.tsx b/test/unit-tests/async-components/structures/ErrorView-test.tsx
index 86898b0398..773c8106fd 100644
--- a/test/unit-tests/async-components/structures/ErrorView-test.tsx
+++ b/test/unit-tests/async-components/structures/ErrorView-test.tsx
@@ -18,8 +18,13 @@ import * as React from "react";
 import { render } from "@testing-library/react";
 
 import ErrorView from "../../../../src/async-components/structures/ErrorView";
+import { setupLanguageMock } from "../../../setup/setupLanguage";
 
 describe("<ErrorView />", () => {
+    beforeEach(() => {
+        setupLanguageMock();
+    });
+
     it("should match snapshot", () => {
         const { asFragment } = render(<ErrorView title="TITLE" messages={["MSG1", "MSG2"]} />);
         expect(asFragment()).toMatchSnapshot();
diff --git a/test/unit-tests/components/views/auth/VectorAuthFooter-test.tsx b/test/unit-tests/components/views/auth/VectorAuthFooter-test.tsx
index 22e13d3f7b..f91d57f48a 100644
--- a/test/unit-tests/components/views/auth/VectorAuthFooter-test.tsx
+++ b/test/unit-tests/components/views/auth/VectorAuthFooter-test.tsx
@@ -18,8 +18,13 @@ import * as React from "react";
 import { render } from "@testing-library/react";
 
 import VectorAuthFooter from "../../../../../src/components/views/auth/VectorAuthFooter";
+import { setupLanguageMock } from "../../../../setup/setupLanguage";
 
 describe("<VectorAuthFooter />", () => {
+    beforeEach(() => {
+        setupLanguageMock();
+    });
+
     it("should match snapshot", () => {
         const { asFragment } = render(<VectorAuthFooter />);
         expect(asFragment()).toMatchSnapshot();
diff --git a/test/unit-tests/components/views/auth/VectorAuthPage-test.tsx b/test/unit-tests/components/views/auth/VectorAuthPage-test.tsx
index 72e432506a..d4c58e0b8e 100644
--- a/test/unit-tests/components/views/auth/VectorAuthPage-test.tsx
+++ b/test/unit-tests/components/views/auth/VectorAuthPage-test.tsx
@@ -18,8 +18,13 @@ import * as React from "react";
 import { render } from "@testing-library/react";
 
 import VectorAuthPage from "../../../../../src/components/views/auth/VectorAuthPage";
+import { setupLanguageMock } from "../../../../setup/setupLanguage";
 
 describe("<VectorAuthPage />", () => {
+    beforeEach(() => {
+        setupLanguageMock();
+    });
+
     it("should match snapshot", () => {
         const { asFragment } = render(<VectorAuthPage />);
         expect(asFragment()).toMatchSnapshot();
diff --git a/test/unit-tests/vector/platform/ElectronPlatform-test.ts b/test/unit-tests/vector/platform/ElectronPlatform-test.ts
index 3c93f98a28..128bacc99b 100644
--- a/test/unit-tests/vector/platform/ElectronPlatform-test.ts
+++ b/test/unit-tests/vector/platform/ElectronPlatform-test.ts
@@ -26,6 +26,7 @@ import DesktopCapturerSourcePicker from "matrix-react-sdk/src/components/views/e
 import { mocked } from "jest-mock";
 
 import ElectronPlatform from "../../../../src/vector/platform/ElectronPlatform";
+import { setupLanguageMock } from "../../../setup/setupLanguage";
 
 jest.mock("matrix-react-sdk/src/rageshake/rageshake", () => ({
     flush: jest.fn(),
@@ -51,6 +52,7 @@ describe("ElectronPlatform", () => {
         window.electron = mockElectron;
         jest.clearAllMocks();
         Object.defineProperty(window, "navigator", { value: { userAgent: defaultUserAgent }, writable: true });
+        setupLanguageMock();
     });
 
     const getElectronEventHandlerCall = (eventType: string): [type: string, handler: Function] | undefined =>
diff --git a/test/unit-tests/vector/platform/WebPlatform-test.ts b/test/unit-tests/vector/platform/WebPlatform-test.ts
index af35137f99..00854a9dd2 100644
--- a/test/unit-tests/vector/platform/WebPlatform-test.ts
+++ b/test/unit-tests/vector/platform/WebPlatform-test.ts
@@ -19,12 +19,14 @@ import { UpdateCheckStatus } from "matrix-react-sdk/src/BasePlatform";
 import { MatrixClientPeg } from "matrix-react-sdk/src/MatrixClientPeg";
 
 import WebPlatform from "../../../../src/vector/platform/WebPlatform";
+import { setupLanguageMock } from "../../../setup/setupLanguage";
 
 fetchMock.config.overwriteRoutes = true;
 
 describe("WebPlatform", () => {
     beforeEach(() => {
         jest.clearAllMocks();
+        setupLanguageMock();
     });
 
     it("returns human readable name", () => {