diff --git a/src/utility/upload.ts b/src/utility/upload.ts
index 72abedbd..84efc930 100644
--- a/src/utility/upload.ts
+++ b/src/utility/upload.ts
@@ -1,4 +1,10 @@
-import {createFileList, isDisabled, isElementType, setFiles} from '../utils'
+import {
+  createFileList,
+  getWindow,
+  isDisabled,
+  isElementType,
+  setFiles,
+} from '../utils'
 import {Config, Instance} from '../setup'
 
 export interface uploadInit {
@@ -36,7 +42,7 @@ export async function upload(
       return
     }
 
-    setFiles(input, createFileList(files))
+    setFiles(input, createFileList(getWindow(element), files))
     this.dispatchUIEvent(input, 'input')
     this.dispatchUIEvent(input, 'change')
   }
diff --git a/src/utils/dataTransfer/DataTransfer.ts b/src/utils/dataTransfer/DataTransfer.ts
index fe622a12..fb13967a 100644
--- a/src/utils/dataTransfer/DataTransfer.ts
+++ b/src/utils/dataTransfer/DataTransfer.ts
@@ -74,63 +74,65 @@ function getTypeMatcher(type: string, exact: boolean) {
   }
 }
 
-class DataTransferStub implements DataTransfer {
-  getData(format: string) {
-    const match =
-      this.items.find(getTypeMatcher(format, true)) ??
-      this.items.find(getTypeMatcher(format, false))
-
-    let text = ''
-    match?.getAsString(t => {
-      text = t
-    })
-
-    return text
-  }
-
-  setData(format: string, data: string) {
-    const matchIndex = this.items.findIndex(getTypeMatcher(format, true))
-
-    const item = new DataTransferItemStub(data, format) as DataTransferItem
-    if (matchIndex >= 0) {
-      this.items.splice(matchIndex, 1, item)
-    } else {
-      this.items.push(item)
+function createDataTransferStub(window: Window & typeof globalThis) {
+  return new (class DataTransferStub implements DataTransfer {
+    getData(format: string) {
+      const match =
+        this.items.find(getTypeMatcher(format, true)) ??
+        this.items.find(getTypeMatcher(format, false))
+
+      let text = ''
+      match?.getAsString(t => {
+        text = t
+      })
+
+      return text
     }
-  }
 
-  clearData(format?: string) {
-    if (format) {
+    setData(format: string, data: string) {
       const matchIndex = this.items.findIndex(getTypeMatcher(format, true))
 
+      const item = new DataTransferItemStub(data, format) as DataTransferItem
       if (matchIndex >= 0) {
-        this.items.remove(matchIndex)
+        this.items.splice(matchIndex, 1, item)
+      } else {
+        this.items.push(item)
       }
-    } else {
-      this.items.clear()
     }
-  }
-
-  dropEffect: DataTransfer['dropEffect'] = 'none'
-  effectAllowed: DataTransfer['effectAllowed'] = 'uninitialized'
 
-  readonly items = new DataTransferItemListStub()
-  readonly files = createFileList([])
+    clearData(format?: string) {
+      if (format) {
+        const matchIndex = this.items.findIndex(getTypeMatcher(format, true))
 
-  get types() {
-    const t = []
-    if (this.files.length) {
-      t.push('Files')
+        if (matchIndex >= 0) {
+          this.items.remove(matchIndex)
+        }
+      } else {
+        this.items.clear()
+      }
     }
-    this.items.forEach(i => t.push(i.type))
 
-    Object.freeze(t)
+    dropEffect: DataTransfer['dropEffect'] = 'none'
+    effectAllowed: DataTransfer['effectAllowed'] = 'uninitialized'
 
-    return t
-  }
+    readonly items = new DataTransferItemListStub()
+    readonly files = createFileList(window, [])
 
-  /* istanbul ignore next */
-  setDragImage() {}
+    get types() {
+      const t = []
+      if (this.files.length) {
+        t.push('Files')
+      }
+      this.items.forEach(i => t.push(i.type))
+
+      Object.freeze(t)
+
+      return t
+    }
+
+    /* istanbul ignore next */
+    setDragImage() {}
+  })()
 }
 
 export function createDataTransfer(
@@ -140,10 +142,10 @@ export function createDataTransfer(
   // Use real DataTransfer if available
   const dt =
     typeof window.DataTransfer === 'undefined'
-      ? (new DataTransferStub() as DataTransfer)
+      ? createDataTransferStub(window)
       : /* istanbul ignore next */ new window.DataTransfer()
 
-  Object.defineProperty(dt, 'files', {get: () => createFileList(files)})
+  Object.defineProperty(dt, 'files', {get: () => createFileList(window, files)})
 
   return dt
 }
diff --git a/src/utils/dataTransfer/FileList.ts b/src/utils/dataTransfer/FileList.ts
index 1de62055..ed5e3b5e 100644
--- a/src/utils/dataTransfer/FileList.ts
+++ b/src/utils/dataTransfer/FileList.ts
@@ -1,6 +1,9 @@
 // FileList can not be created per constructor.
 
-export function createFileList(files: File[]): FileList {
+export function createFileList(
+  window: Window & typeof globalThis,
+  files: File[],
+): FileList {
   const list: FileList & Iterable<File> = {
     ...files,
     length: files.length,
@@ -11,8 +14,8 @@ export function createFileList(files: File[]): FileList {
       }
     },
   }
-  list.constructor = FileList
-  Object.setPrototypeOf(list, FileList.prototype)
+  list.constructor = window.FileList
+  Object.setPrototypeOf(list, window.FileList.prototype)
   Object.freeze(list)
 
   return list
diff --git a/tests/utils/dataTransfer/FileList.ts b/tests/utils/dataTransfer/FileList.ts
index e6ac8826..49d2f67a 100644
--- a/tests/utils/dataTransfer/FileList.ts
+++ b/tests/utils/dataTransfer/FileList.ts
@@ -2,7 +2,7 @@ import {createFileList} from '#src/utils'
 
 test('implement FileList', () => {
   const file = new File(['hello'], 'hello.png', {type: 'image/png'})
-  const list = createFileList([file])
+  const list = createFileList(window, [file])
 
   expect(list).toBeInstanceOf(FileList)
   expect(list).toHaveLength(1)
diff --git a/tests/utils/edit/setFiles.ts b/tests/utils/edit/setFiles.ts
index 8168f18e..17c20a10 100644
--- a/tests/utils/edit/setFiles.ts
+++ b/tests/utils/edit/setFiles.ts
@@ -6,7 +6,7 @@ test('set files', () => {
     `<input type="file"/>`,
   )
 
-  const list = createFileList([new File(['foo'], 'foo.txt')])
+  const list = createFileList(window, [new File(['foo'], 'foo.txt')])
   setFiles(element, list)
 
   expect(element).toHaveProperty('files', list)
@@ -20,7 +20,7 @@ test('switching type resets value', () => {
 
   expect(element).toHaveValue('')
 
-  const list = createFileList([new File(['foo'], 'foo.txt')])
+  const list = createFileList(window, [new File(['foo'], 'foo.txt')])
   setFiles(element as HTMLInputElement & {type: 'file'}, list)
 
   element.type = 'file'
@@ -38,7 +38,7 @@ test('setting value resets `files`', () => {
     `<input type="file"/>`,
   )
 
-  const list = createFileList([new File(['foo'], 'foo.txt')])
+  const list = createFileList(window, [new File(['foo'], 'foo.txt')])
   setFiles(element, list)
 
   // Everything but an empty string throws an error in the browser
@@ -58,7 +58,7 @@ test('is save to call multiple times', () => {
     `<input type="file"/>`,
   )
 
-  const list = createFileList([new File(['foo'], 'foo.txt')])
+  const list = createFileList(window, [new File(['foo'], 'foo.txt')])
   setFiles(element, list)
   setFiles(element, list)