diff --git a/project/forms/oauth2_client.py b/project/forms/oauth2_client.py
index 2f3f265..2a28504 100644
--- a/project/forms/oauth2_client.py
+++ b/project/forms/oauth2_client.py
@@ -77,8 +77,9 @@ class BaseOAuth2ClientForm(FlaskForm):
         if not obj:
             return
 
-        self.redirect_uris.data = os.linesep.join(obj.redirect_uris)
-        self.scope.data = obj.scope.split(" ")
+        formdata = self.meta.wrap_formdata(self, formdata)
+        self.redirect_uris.process(formdata, os.linesep.join(obj.redirect_uris))
+        self.scope.process(formdata, obj.scope.split(" "))
 
 
 class CreateOAuth2ClientForm(BaseOAuth2ClientForm):
diff --git a/tests/views/test_oauth2_client.py b/tests/views/test_oauth2_client.py
index 330acb8..01eb2c1 100644
--- a/tests/views/test_oauth2_client.py
+++ b/tests/views/test_oauth2_client.py
@@ -78,6 +78,7 @@ def test_update(client, seeder, utils, app, mocker, db_error):
         response,
         {
             "client_name": "Neuer Name",
+            "redirect_uris": "localhost:1337\nlocalhost:1338",
         },
     )
 
@@ -92,6 +93,7 @@ def test_update(client, seeder, utils, app, mocker, db_error):
 
         oauth2_client = OAuth2Client.query.get(oauth2_client_id)
         assert oauth2_client.client_name == "Neuer Name"
+        assert oauth2_client.redirect_uris == ["localhost:1337", "localhost:1338"]
 
 
 @pytest.mark.parametrize("db_error", [True, False])