Filtered out 'base' from database backend choices error message.

1 files changed, 1 insertions, 1 deletions

diff --git a/django/db/utils.py b/django/db/utils.py
index e5c4b8371b..20314495e4 100644
--- a/django/db/utils.py
+++ b/django/db/utils.py
@@ -114,7 +114,7 @@ def load_backend(backend_name):
         try:
             builtin_backends = [
                 name for _, name, ispkg in pkgutil.iter_modules([backend_dir])
-                if ispkg and name != 'dummy']
+                if ispkg and name not in {'base', 'dummy'}]
         except EnvironmentError:
             builtin_backends = []
         if backend_name not in ['django.db.backends.%s' % b for b in