diff --git a/planetmint/backend/connection.py b/planetmint/backend/connection.py
index 44e8257..0f26b32 100644
--- a/planetmint/backend/connection.py
+++ b/planetmint/backend/connection.py
@@ -9,13 +9,15 @@ from importlib import import_module
 from planetmint.backend.utils import get_planetmint_config_value
 
 BACKENDS = {  # This is path to MongoDBClass
-    'tarantool_db': r'planetmint.backend.tarantool.connection.TarantoolDB',
+    'tarantool_db': 'planetmint.backend.tarantool.connection.TarantoolDB',
     'localmongodb': 'planetmint.backend.localmongodb.connection.LocalMongoDBConnection'
 }
 
 logger = logging.getLogger(__name__)
-
 backend = get_planetmint_config_value("backend")
+if not backend:
+    backend = 'tarantool_db'    
+    
 modulepath, _, class_name = BACKENDS[backend].rpartition('.')
 current_backend = getattr(import_module(modulepath), class_name)