diff --git a/tests/setup/vitest.setup.ts b/tests/setup/vitest.setup.ts
index 8eacaceb..f149f27a 100644
--- a/tests/setup/vitest.setup.ts
+++ b/tests/setup/vitest.setup.ts
@@ -1,22 +1 @@
 import "@testing-library/jest-dom/vitest";
-
-if (typeof globalThis.ProgressEvent === "undefined") {
-  class TestProgressEvent extends Event implements ProgressEvent {
-    readonly lengthComputable: boolean;
-    readonly loaded: number;
-    readonly total: number;
-
-    constructor(type: string, eventInitDict: ProgressEventInit = {}) {
-      super(type, eventInitDict);
-      this.lengthComputable = eventInitDict.lengthComputable ?? false;
-      this.loaded = eventInitDict.loaded ?? 0;
-      this.total = eventInitDict.total ?? 0;
-    }
-  }
-
-  Object.defineProperty(globalThis, "ProgressEvent", {
-    configurable: true,
-    writable: true,
-    value: TestProgressEvent
-  });
-}