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-rw-r--r--djangorestframework/resources.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/djangorestframework/resources.py b/djangorestframework/resources.py
index f4a2ab14..99c45244 100644
--- a/djangorestframework/resources.py
+++ b/djangorestframework/resources.py
@@ -111,7 +111,7 @@ class FormResource(Resource):
# To get around this case we revalidate with some fake data.
if fake_data:
data[fake_data] = '_fake_data'
- allowed_extra_fields = allowed_extra_fields + ('_fake_data',)
+ allowed_extra_fields = tuple(allowed_extra_fields) + ('_fake_data',)
bound_form = self.get_bound_form(data, files)