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-rw-r--r--django/contrib/postgres/fields/array.py3
1 files changed, 1 insertions, 2 deletions
diff --git a/django/contrib/postgres/fields/array.py b/django/contrib/postgres/fields/array.py
index a6079466af..b87575235e 100644
--- a/django/contrib/postgres/fields/array.py
+++ b/django/contrib/postgres/fields/array.py
@@ -28,8 +28,7 @@ class ArrayField(CheckFieldDefaultMixin, Field):
self.base_field = base_field
self.size = size
if self.size:
- self.default_validators = self.default_validators[:]
- self.default_validators.append(ArrayMaxLengthValidator(self.size))
+ self.default_validators = [*self.default_validators, ArrayMaxLengthValidator(self.size)]
# For performance, only add a from_db_value() method if the base field
# implements it.
if hasattr(self.base_field, 'from_db_value'):