diff --git a/config_tempest/main.py b/config_tempest/main.py
index 2aa3a645..f7a4c4c5 100755
--- a/config_tempest/main.py
+++ b/config_tempest/main.py
@@ -90,7 +90,7 @@ def load_basic_defaults(conf):
             ("alt_project_name", "alt_demo")
         ],
         "auth": [
-            ("tempest_roles", "_member_"),
+            ("tempest_roles", "member"),
             ("admin_username", "admin"),
             ("admin_project_name", "admin"),
             ("admin_domain_name", "Default")
diff --git a/releasenotes/notes/Change-default-auth.tempest_roles-to-member-8b386694c5f8df2f.yaml b/releasenotes/notes/Change-default-auth.tempest_roles-to-member-8b386694c5f8df2f.yaml
new file mode 100644
index 00000000..119a1805
--- /dev/null
+++ b/releasenotes/notes/Change-default-auth.tempest_roles-to-member-8b386694c5f8df2f.yaml
@@ -0,0 +1,10 @@
+---
+upgrade:
+  - |
+    The following option has changed its default value from
+
+    * ``CONF.auth.tempest_roles _member_``
+
+    to
+
+    * ``CONF.auth.tempest_roles member``