diff --git a/tests/test_manager.py b/tests/test_manager.py
index 422b1a95..1f87e4b7 100644
--- a/tests/test_manager.py
+++ b/tests/test_manager.py
@@ -178,7 +178,7 @@ def test_page_edit_picture(app, admin_user):
resp = resp.click(href='.*/picture/')
resp.form['picture'] = Upload('black.svg',
- '', 'image/svg+xml')
+ b'', 'image/svg+xml')
resp = resp.form.submit()
assert resp.location.endswith('/manage/pages/%s/' % page.id)
resp = resp.follow()
@@ -860,7 +860,7 @@ def test_asset_slots_management(app, admin_user):
assert '>Delete<' not in resp.text
resp = resp.click('Overwrite')
- resp.form['upload'] = Upload('test.pdf', 'PDF-1.4 ...', 'application.pdf')
+ resp.form['upload'] = Upload('test.pdf', b'PDF-1.4 ...', 'application.pdf')
resp = resp.form.submit().follow()
assert 'test.pdf' in resp.text
assert '