diff --git a/integrations/mongodb_atlas/tests/test_document_store.py b/integrations/mongodb_atlas/tests/test_document_store.py
index f8ba392b1..40fe563fa 100644
--- a/integrations/mongodb_atlas/tests/test_document_store.py
+++ b/integrations/mongodb_atlas/tests/test_document_store.py
@@ -19,7 +19,7 @@
 @pytest.fixture
 def document_store():
     database_name = "haystack_integration_test"
-    collection_name = "test_collection_"+str(uuid4())
+    collection_name = "test_collection_" + str(uuid4())
 
     connection: MongoClient = MongoClient(
         os.environ["MONGO_CONNECTION_STRING"], driver=DriverInfo(name="MongoDBAtlasHaystackIntegration")