diff --git a/backend/api_server.py b/backend/api_server.py
index b15f31a..2abfbf1 100755
--- a/backend/api_server.py
+++ b/backend/api_server.py
@@ -1303,7 +1303,10 @@ def load_qc_apps():
 def serve_web_ui():
     """Serve the web UI"""
     try:
-        with open('web_ui.html', 'r') as f:
+        # Use absolute path to web_ui.html (located in parent directory)
+        base_dir = os.path.dirname(os.path.abspath(__file__))
+        web_ui_path = os.path.join(os.path.dirname(base_dir), 'web_ui.html')
+        with open(web_ui_path, 'r') as f:
             html_content = f.read()
         return Response(html_content, mimetype='text/html')
     except FileNotFoundError: