diff --git a/mkdocs_with_confluence/plugin.py b/mkdocs_with_confluence/plugin.py
index 13d5e9a..051f299 100644
--- a/mkdocs_with_confluence/plugin.py
+++ b/mkdocs_with_confluence/plugin.py
@@ -20,8 +20,8 @@ class MkdocsWithConfluence(BasePlugin):
         ("host_url", config_options.Type(str, default=None)),
         ("space", config_options.Type(str, default=None)),
         ("parent_page_name", config_options.Type(str, default=None)),
-        ("username", config_options.Type(str, default=environ.get('JIRA_USERNAME',None))),
-        ("password", config_options.Type(str, default=environ.get('JIRA_PASSWORD',None))),
+        ("username", config_options.Type(str, default=environ.get("JIRA_USERNAME", None))),
+        ("password", config_options.Type(str, default=environ.get("JIRA_PASSWORD", None))),
         ("enabled_if_env", config_options.Type(str, default=None)),
         ("verbose", config_options.Type(bool, default=False)),
         ("debug", config_options.Type(bool, default=False)),