diff --git a/redbot/core/drivers/red_mongo.py b/redbot/core/drivers/red_mongo.py
index 3bb6240a6..18a6382e4 100644
--- a/redbot/core/drivers/red_mongo.py
+++ b/redbot/core/drivers/red_mongo.py
@@ -1,5 +1,6 @@
 import motor.motor_asyncio
 from .red_base import BaseDriver
+from urllib.parse import quote_plus
 
 __all__ = ["Mongo"]
 
@@ -15,7 +16,9 @@ def _initialize(**kwargs):
     db_name = kwargs.get("DB_NAME", "default_db")
 
     if admin_user is not None and admin_pass is not None:
-        url = "mongodb://{}:{}@{}:{}/{}".format(admin_user, admin_pass, host, port, db_name)
+        url = "mongodb://{}:{}@{}:{}/{}".format(
+            quote_plus(admin_user), quote_plus(admin_pass), host, port, db_name
+        )
     else:
         url = "mongodb://{}:{}/{}".format(host, port, db_name)