diff --git a/django/db/backends/oracle/creation.py b/django/db/backends/oracle/creation.py
index 08b130229f..29293db20a 100644
--- a/django/db/backends/oracle/creation.py
+++ b/django/db/backends/oracle/creation.py
@@ -267,5 +267,5 @@ class DatabaseCreation(BaseDatabaseCreation):
             settings_dict['PORT'],
             settings_dict['ENGINE'],
             settings_dict['NAME'],
-            settings_dict['TEST_USER'],
+            self._test_database_user(),
         )