diff --git a/fs/resources/test-helpers.js b/fs/resources/test-helpers.js
index f185e2f48b6e791..4bcf5d7e8341e22 100644
--- a/fs/resources/test-helpers.js
+++ b/fs/resources/test-helpers.js
@@ -17,13 +17,9 @@ const LOCK_ACCESS = {
 };
 
 // Array of separators used to separate components in hierarchical paths.
-let kPathSeparators;
-if (navigator.userAgent.includes('Windows NT')) {
-  // Windows uses both '/' and '\' as path separators.
-  kPathSeparators = ['/', '\\'];
-} else {
-  kPathSeparators = ['/'];
-}
+// Consider both '/' and '\' as path separators to ensure file names are
+// platform-agnostic.
+let kPathSeparators = ['/', '\\'];
 
 async function getFileSize(handle) {
   const file = await handle.getFile();
diff --git a/fs/script-tests/FileSystemFileHandle-move.js b/fs/script-tests/FileSystemFileHandle-move.js
index dd848626e4a747f..c5d08f305d06123 100644
--- a/fs/script-tests/FileSystemFileHandle-move.js
+++ b/fs/script-tests/FileSystemFileHandle-move.js
@@ -50,25 +50,15 @@ directory_test(async (t, root) => {
   assert_array_equals(await getSortedDirectoryEntries(root), ['file-1']);
 }, 'move(name) can be called multiple times');
 
-directory_test(async (t, root) => {
-  const dir = await root.getDirectoryHandle('dir', {create: true});
-  const handle = await createFileWithContents(t, 'file-before', 'foo', dir);
-  await promise_rejects_js(t, TypeError, handle.move('Lorem.'));
-
-  assert_array_equals(await getSortedDirectoryEntries(root), ['dir/']);
-  assert_array_equals(await getSortedDirectoryEntries(dir), ['file-before']);
-  assert_equals(await getFileContents(handle), 'foo');
-  assert_equals(await getFileSize(handle), 3);
-}, 'move(name) with a name with a trailing period should fail');
-
 directory_test(async (t, root) => {
   const handle = await createFileWithContents(t, 'file-before', 'foo', root);
   await promise_rejects_js(t, TypeError, handle.move('test/test'));
+  await promise_rejects_js(t, TypeError, handle.move('test\\test'));
 
   assert_array_equals(await getSortedDirectoryEntries(root), ['file-before']);
   assert_equals(await getFileContents(handle), 'foo');
   assert_equals(await getFileSize(handle), 3);
-}, 'move(name) with a name with invalid characters should fail');
+}, 'move(name) with a name with path separators should fail');
 
 directory_test(async (t, root) => {
   const handle = await createFileWithContents(t, 'file-before', 'abc', root);