diff --git a/addon/access_token.py b/addon/access_token.py
index 786c5c2..ceac509 100644
--- a/addon/access_token.py
+++ b/addon/access_token.py
@@ -119,7 +119,7 @@ class AccessTokenScanner:
         print("[TOKENDEBUG] No matched.")
         return None
 
-    def _is_implicit_flow(request_url: str) -> bool:
+    def _is_implicit_flow(self, request_url: str) -> bool:
         """
         URL의 파라미터에서 OAuth Implicit Flow 패턴을 체크합니다.