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-rw-r--r--django/contrib/admin/templatetags/admin_modify.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/django/contrib/admin/templatetags/admin_modify.py b/django/contrib/admin/templatetags/admin_modify.py
index e5f31ba723..ef33bb33b0 100644
--- a/django/contrib/admin/templatetags/admin_modify.py
+++ b/django/contrib/admin/templatetags/admin_modify.py
@@ -118,7 +118,7 @@ class FieldWrapper(object):
return not isinstance(self.field, models.AutoField)
def header_class_attribute(self):
- return self.field.blank and ' class="optional"' or ''
+ return self.field.blank and mark_safe(' class="optional"') or ''
def use_raw_id_admin(self):
return isinstance(self.field.rel, (models.ManyToOneRel, models.ManyToManyRel)) \