diff --git a/django/db/backends/sqlite3/creation.py b/django/db/backends/sqlite3/creation.py
index f3bb8dd3b2..4a4046c670 100644
--- a/django/db/backends/sqlite3/creation.py
+++ b/django/db/backends/sqlite3/creation.py
@@ -55,7 +55,7 @@ class DatabaseCreation(BaseDatabaseCreation):
             return orig_settings_dict
         else:
             root, ext = os.path.splitext(orig_settings_dict['NAME'])
-            return {**orig_settings_dict, 'NAME': '{}_{}.{}'.format(root, suffix, ext)}
+            return {**orig_settings_dict, 'NAME': '{}_{}{}'.format(root, suffix, ext)}
 
     def _clone_test_db(self, suffix, verbosity, keepdb=False):
         source_database_name = self.connection.settings_dict['NAME']
diff --git a/tests/backends/sqlite/test_creation.py b/tests/backends/sqlite/test_creation.py
index 723e481077..6ec4262f73 100644
--- a/tests/backends/sqlite/test_creation.py
+++ b/tests/backends/sqlite/test_creation.py
@@ -14,3 +14,20 @@ class TestDbSignatureTests(SimpleTestCase):
         test_connection.settings_dict['TEST']['NAME'] = 'custom.sqlite.db'
         signature = test_connection.creation_class(test_connection).test_db_signature()
         self.assertEqual(signature, (None, 'custom.sqlite.db'))
+
+    def test_get_test_db_clone_settings_name(self):
+        test_connection = copy.copy(connections[DEFAULT_DB_ALIAS])
+        test_connection.settings_dict = copy.deepcopy(
+            connections[DEFAULT_DB_ALIAS].settings_dict,
+        )
+        tests = [
+            ('test.sqlite3', 'test_1.sqlite3'),
+            ('test', 'test_1'),
+        ]
+        for test_db_name, expected_clone_name in tests:
+            with self.subTest(test_db_name=test_db_name):
+                test_connection.settings_dict['NAME'] = test_db_name
+                test_connection.settings_dict['TEST']['NAME'] = test_db_name
+                creation_class = test_connection.creation_class(test_connection)
+                clone_settings_dict = creation_class.get_test_db_clone_settings('1')
+                self.assertEqual(clone_settings_dict['NAME'], expected_clone_name)