diff --git a/README.rst b/README.rst
index db014c5f..1d5e1b22 100644
--- a/README.rst
+++ b/README.rst
@@ -4,7 +4,7 @@
 .. image:: https://coveralls.io/repos/github/keitaroinc/ckanext-saml2auth/badge.svg?branch=main
     :target: https://coveralls.io/github/keitaroinc/ckanext-saml2auth?branch=main
 
-.. image:: https://badges.gitter.im/keitaroinc/ckan.svg)
+.. image:: https://badges.gitter.im/keitaroinc/ckan.svg
     :target: https://gitter.im/keitaroinc/ckan?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge
 
 .. image:: https://img.shields.io/pypi/v/ckanext-saml2auth