diff --git a/gslib/utils/shim_util.py b/gslib/utils/shim_util.py
index c8b3c77db..aaad290ea 100644
--- a/gslib/utils/shim_util.py
+++ b/gslib/utils/shim_util.py
@@ -275,7 +275,7 @@ def _get_gcs_json_endpoint_from_boto_config(config):
     gs_json_port = config.get('Credentials', 'gs_json_port')
     port = ':' + gs_json_port if gs_json_port else ''
     json_api_version = config.get('Credentials', 'json_api_version', 'v1')
-    return 'https://{}{}/storage/{}'.format(gs_json_host, port,
+    return 'https://{}{}/storage/{}/'.format(gs_json_host, port,
                                             json_api_version)
   return None