diff --git a/tests/test_mail.py b/tests/test_mail.py
index 17321b4..e8fa960 100644
--- a/tests/test_mail.py
+++ b/tests/test_mail.py
@@ -21,5 +21,5 @@ def test_mails(logged_app, data):
 
     page = logged_app.get('/api/mail/')
     assert page.status_code == 200
-    content = json.loads(page.content)
+    content = json.loads(page.content.decode('utf-8'))
     #print(json.dumps(content, indent=2))