diff --git a/project.config b/project.config
index a690766..a8f2f9b 100644
--- a/project.config
+++ b/project.config
@@ -95,5 +95,6 @@
 	submit = group Registered Users
 	forgeAuthor = group ldap/OSM_Contributor
 	forgeCommitter = group ldap/OSM_Contributor
+	exclusiveGroupPermissions = forgeAuthor forgeCommitter
 [plugin "its-bugzilla"]
 	enabled = true