diff --git a/package.json b/package.json
index 1956b2814..5fa997dae 100644
--- a/package.json
+++ b/package.json
@@ -92,9 +92,6 @@
     "typescript": "^3.7.3"
   },
   "jest": {
-    "testEnvironment": "node",
-    "setupFilesAfterEnv": [
-      "<rootDir>/spec/setupTests.js"
-    ]
+    "testEnvironment": "node"
   }
 }
diff --git a/spec/setupTests.js b/spec/browserify/setupTests.js
similarity index 100%
rename from spec/setupTests.js
rename to spec/browserify/setupTests.js
diff --git a/spec/browserify/sync-browserify.spec.js b/spec/browserify/sync-browserify.spec.js
index d11a8f69d..91d430c0b 100644
--- a/spec/browserify/sync-browserify.spec.js
+++ b/spec/browserify/sync-browserify.spec.js
@@ -14,6 +14,8 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
+// load XmlHttpRequest mock
+import "./setupTests";
 import "../../dist/browser-matrix"; // uses browser-matrix instead of the src
 import {MockStorageApi} from "../MockStorageApi";
 import {WebStorageSessionStore} from "../../src/store/session/webstorage";
@@ -65,6 +67,11 @@ describe("Browserify Test", function() {
         await httpBackend.stop();
     });
 
+    afterAll(() => {
+        // clean up XMLHttpRequest mock
+        global.XMLHttpRequest = undefined;
+    });
+
     it("Sync", async function() {
         const event = utils.mkMembership({
             room: ROOM_ID,