diff --git a/flask_admin/tests/pymongo/conftest.py b/flask_admin/tests/pymongo/conftest.py
index eb3dc2062..0b559ca44 100644
--- a/flask_admin/tests/pymongo/conftest.py
+++ b/flask_admin/tests/pymongo/conftest.py
@@ -9,6 +9,7 @@ def db():
     client = MongoClient()
     db = client.tests
     yield db
+    client.close()
 
 
 @pytest.fixture