diff --git a/gallery_dl/extractor/sankaku.py b/gallery_dl/extractor/sankaku.py
index 55790174..c9241ac0 100644
--- a/gallery_dl/extractor/sankaku.py
+++ b/gallery_dl/extractor/sankaku.py
@@ -250,7 +250,8 @@ class SankakuAPI():
                 success = True
             if not success:
                 code = data.get("code")
-                if code and code.endswith(("invalid-token", "invalid_token")):
+                if code and code.endswith(
+                        ("unauthorized", "invalid-token", "invalid_token")):
                     _authenticate_impl.invalidate(self.username)
                     continue
                 raise exception.StopExtraction(code)