diff --git a/django/db/backends/oracle/creation.py b/django/db/backends/oracle/creation.py
index fd02ca07ba..db64912a13 100644
--- a/django/db/backends/oracle/creation.py
+++ b/django/db/backends/oracle/creation.py
@@ -121,7 +121,7 @@ class DatabaseCreation(BaseDatabaseCreation):
             settings_dict['PORT'],
             settings_dict['ENGINE'],
             settings_dict['NAME'],
-            settings_dict['TEST_USER'],
+            self._test_database_user(),
         )
 
     def _destroy_test_db(self, test_database_name, verbosity=1):