diff --git a/check_mongodb.py b/check_mongodb.py
index f4102ee..128fb95 100755
--- a/check_mongodb.py
+++ b/check_mongodb.py
@@ -200,7 +200,7 @@ def main(argv):
     # moving the login up here and passing in the connection
     #
     start = time.time()
-    err, con = mongo_connect(host, port, ssl, user, passwd, replicaset, authdb, insecure, ssl_ca_cert_file, cert_file, retry_writes_disabled=retry_writes_disabled)
+    err, con = mongo_connect(host, port, ssl, user, passwd, replicaset, authdb, insecure, ssl_ca_cert_file, cert_file, auth_mechanism, retry_writes_disabled)
 
     if err != 0:
         return err