diff --git a/defaults/main.yml b/defaults/main.yml
index 6c852855..4904d82d 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -215,6 +215,12 @@ glance_service_names:
   - "glance-api"
   - "glance-registry"
 
+# This variable is used by the repo_build process to determine
+# which host group to check for members of before building the
+# pip packages required by this role. The value is picked up
+# by the py_pkgs lookup.
+glance_role_project_group: glance_all
+
 ## Tunable overrides
 glance_glance_api_paste_ini_overrides: {}
 glance_glance_api_conf_overrides: {}