diff --git a/longs/forms.py b/longs/forms.py
index d3493c4b..dd9c5ef3 100755
--- a/longs/forms.py
+++ b/longs/forms.py
@@ -269,7 +269,7 @@ LongSeriesImageFormSet = inlineformset_factory(
 class ExamForm(ExamFormMixin, ModelForm):
     class Meta(ExamFormMixin.Meta):
         model = Exam
-        fields = ExamAuthorFormMixin.Meta.fields + ["double_mark"]
+        fields = ExamFormMixin.Meta.fields + ["double_mark"]
 
 class ExamAuthorForm(ExamAuthorFormMixin):
     class Meta(ExamAuthorFormMixin.Meta):