diff --git a/monkey/monkey_island/cc/resources/AbstractResource.py b/monkey/monkey_island/cc/resources/AbstractResource.py
index 799cd5a23..8482926be 100644
--- a/monkey/monkey_island/cc/resources/AbstractResource.py
+++ b/monkey/monkey_island/cc/resources/AbstractResource.py
@@ -1,6 +1,8 @@
+from typing import List
+
 import flask_restful
 
 
 # The purpose of this class is to decouple resources from flask
 class AbstractResource(flask_restful.Resource):
-    urls = []
+    urls: List[str] = []