diff --git a/flado/blueprints.py b/flado/blueprints.py
index 12f09e6..5e2117a 100644
--- a/flado/blueprints.py
+++ b/flado/blueprints.py
@@ -52,7 +52,7 @@ def index() -> str:
     search_query = request.args.get('search', '')
 
     # Validate filter type
-    valid_filters = ['all', 'today', 'upcoming', 'active', 'completed']
+    valid_filters = ['all', 'today', 'upcoming', 'overdue', 'active', 'completed']
     if filter_type not in valid_filters:
         filter_type = 'all'