diff --git a/bibtexparser/middlewares/enclosing.py b/bibtexparser/middlewares/enclosing.py
index 542914f8..82f9cc87 100644
--- a/bibtexparser/middlewares/enclosing.py
+++ b/bibtexparser/middlewares/enclosing.py
@@ -139,7 +139,7 @@ def __init__(
     # docstr-coverage: inherited
     @classmethod
     def metadata_key(cls) -> str:
-        return "remove_enclosing"
+        return "add_enclosing"
 
     def _enclose(
         self,