diff --git a/yarl/_url.py b/yarl/_url.py
index b1bbdf302..674f3097a 100644
--- a/yarl/_url.py
+++ b/yarl/_url.py
@@ -1248,7 +1248,6 @@ def with_path(self, path: str, *, encoded: bool = False) -> "URL":
             path = "/" + path
         return URL(self._val._replace(path=path, query="", fragment=""), encoded=True)
 
-    @classmethod
     def _get_str_query_from_sequence_iterable(
         self,
         items: Iterable[Tuple[Union[str, istr], QueryVariable]],