diff --git a/pyhilo/api.py b/pyhilo/api.py
index 77cbee5..b19ae12 100644
--- a/pyhilo/api.py
+++ b/pyhilo/api.py
@@ -165,7 +165,7 @@ async def async_auth_password(
         api._username = username
         api._state_yaml = state_yaml
         api.state = get_state(state_yaml)
-        password = parse.quote(password, safe="!@#$%^&*()")
+        password = parse.quote(password, safe="!@#$%^&*()+")
         auth_body = api.auth_body(
             AUTH_TYPE_PASSWORD, username=username, password=password
         )