diff --git a/django/db/backends/postgresql/compiler.py b/django/db/backends/postgresql/compiler.py
index 2394d90f55..3b972b5ba5 100644
--- a/django/db/backends/postgresql/compiler.py
+++ b/django/db/backends/postgresql/compiler.py
@@ -43,7 +43,7 @@ class SQLInsertCompiler(BaseSQLInsertCompiler):
         db_types = [field.db_type(self.connection) for field in fields]
         # Abort if any of the fields are arrays as UNNEST indiscriminately
         # flatten them instead of reducing their nesting by one.
-        if any(db_type.endswith("[]") for db_type in db_types):
+        if any(db_type.endswith("]") for db_type in db_types):
             return super().assemble_as_sql(fields, value_rows)
         return InsertUnnest(["(%%s)::%s[]" % db_type for db_type in db_types]), [
             list(map(list, zip(*value_rows)))
diff --git a/tests/postgres_tests/migrations/0002_create_test_models.py b/tests/postgres_tests/migrations/0002_create_test_models.py
index 188f79607d..31705ae21a 100644
--- a/tests/postgres_tests/migrations/0002_create_test_models.py
+++ b/tests/postgres_tests/migrations/0002_create_test_models.py
@@ -167,6 +167,28 @@ class Migration(migrations.Migration):
             },
             bases=(models.Model,),
         ),
+        migrations.CreateModel(
+            name="WithSizeArrayModel",
+            fields=[
+                (
+                    "id",
+                    models.AutoField(
+                        verbose_name="ID",
+                        serialize=False,
+                        auto_created=True,
+                        primary_key=True,
+                    ),
+                ),
+                (
+                    "field",
+                    ArrayField(models.FloatField(), size=2, null=True, blank=True),
+                ),
+            ],
+            options={
+                "required_db_vendor": "postgresql",
+            },
+            bases=(models.Model,),
+        ),
         migrations.CreateModel(
             name="NullableIntegerArrayModel",
             fields=[
diff --git a/tests/postgres_tests/models.py b/tests/postgres_tests/models.py
index e3118bc590..1563f6a35d 100644
--- a/tests/postgres_tests/models.py
+++ b/tests/postgres_tests/models.py
@@ -64,6 +64,10 @@ class DateTimeArrayModel(PostgreSQLModel):
     times = ArrayField(models.TimeField())
 
 
+class WithSizeArrayModel(PostgreSQLModel):
+    field = ArrayField(models.FloatField(), size=3)
+
+
 class NestedIntegerArrayModel(PostgreSQLModel):
     field = ArrayField(ArrayField(models.IntegerField()))
 
diff --git a/tests/postgres_tests/test_array.py b/tests/postgres_tests/test_array.py
index d930a01a1d..9ad4ec16e9 100644
--- a/tests/postgres_tests/test_array.py
+++ b/tests/postgres_tests/test_array.py
@@ -28,6 +28,7 @@ from .models import (
     OtherTypesArrayModel,
     PostgreSQLModel,
     Tag,
+    WithSizeArrayModel,
 )
 
 try:
@@ -216,6 +217,16 @@ class TestQuerying(PostgreSQLTestCase):
             ]
         )
 
+    def test_bulk_create_with_sized_arrayfield(self):
+        objs = WithSizeArrayModel.objects.bulk_create(
+            [
+                WithSizeArrayModel(field=[1, 2]),
+                WithSizeArrayModel(field=[3, 4]),
+            ]
+        )
+        self.assertEqual(objs[0].field, [1, 2])
+        self.assertEqual(objs[1].field, [3, 4])
+
     def test_empty_list(self):
         NullableIntegerArrayModel.objects.create(field=[])
         obj = (