diff --git a/lib/entitlements/backend/github_team/provider.rb b/lib/entitlements/backend/github_team/provider.rb
index f979c1f..7becd20 100644
--- a/lib/entitlements/backend/github_team/provider.rb
+++ b/lib/entitlements/backend/github_team/provider.rb
@@ -200,7 +200,7 @@ def diff_existing_updated_metadata(existing_group, group, base_diff)
           end
 
           existing_maintainers = existing_group.metadata_fetch_if_exists("team_maintainers")
-          changed_maintainers = group.metadata_fetch_if_exists("team_maintainers")
+          changed_maintainers = group.metadata_fetch_if_exists("team_maintainers")&.downcase
           if existing_maintainers != changed_maintainers
             base_diff[:metadata] ||= {}
             if existing_maintainers.nil? && !changed_maintainers.nil?