diff --git a/tests/aggregation/tests.py b/tests/aggregation/tests.py
index a759fd4d365..62704c4bd27 100644
--- a/tests/aggregation/tests.py
+++ b/tests/aggregation/tests.py
@@ -5,10 +5,10 @@ from decimal import Decimal
 from django.core.exceptions import FieldError
 from django.db import connection
 from django.db.models import (
-    Avg, Case, Count, DecimalField, DurationField, Exists, F, FloatField, Func,
+    Avg, Case, Count, DecimalField, DurationField, Exists, F, FloatField,
     IntegerField, Max, Min, OuterRef, Subquery, Sum, Value, When,
 )
-from django.db.models.functions import Coalesce
+from django.db.models.functions import Coalesce, Greatest
 from django.test import TestCase
 from django.test.testcases import skipUnlessDBFeature
 from django.test.utils import Approximate, CaptureQueriesContext
@@ -1102,14 +1102,6 @@ class AggregateTestCase(TestCase):
             {'books_per_rating__max': 3 + 5})
 
     def test_expression_on_aggregation(self):
-
-        # Create a plain expression
-        class Greatest(Func):
-            function = 'GREATEST'
-
-            def as_sqlite(self, compiler, connection, **extra_context):
-                return super().as_sql(compiler, connection, function='MAX', **extra_context)
-
         qs = Publisher.objects.annotate(
             price_or_median=Greatest(Avg('book__rating', output_field=DecimalField()), Avg('book__price'))
         ).filter(price_or_median__gte=F('num_awards')).order_by('num_awards')