diff --git a/swiftplugin/swiftplugin/swiftplugin.py b/swiftplugin/swiftplugin/swiftplugin.py
index 632ceac..6478524 100644
--- a/swiftplugin/swiftplugin/swiftplugin.py
+++ b/swiftplugin/swiftplugin/swiftplugin.py
@@ -179,7 +179,7 @@ def handle_assignment_request(self):
             body = {
                 'referenceId': self.reference_id,
                 'studentId': self.student_id(),
-                'blockId': self.scope_ids.def_id
+                'blockId': self.scope_ids.usage_id
             }
             url = self.build_api_url("request")
             r = requests.post(url, json=body,