diff --git a/Tools/peg_generator/pegen/grammar_parser.py b/Tools/peg_generator/pegen/grammar_parser.py
index 892df5cf8ccca1..de735649d46159 100644
--- a/Tools/peg_generator/pegen/grammar_parser.py
+++ b/Tools/peg_generator/pegen/grammar_parser.py
@@ -420,7 +420,7 @@ def named_item(self) -> Optional[NamedItem]:
             and
             (item := self.item())
         ):
-            return NamedItem ( name . string , item , f"{type.string}*" )
+            return NamedItem ( name . string , item , type . string + "*" )
         self.reset(mark)
         if cut: return None
         cut = False
diff --git a/Tools/peg_generator/pegen/metagrammar.gram b/Tools/peg_generator/pegen/metagrammar.gram
index bb4355fd189e05..77695d5e0a91a0 100644
--- a/Tools/peg_generator/pegen/metagrammar.gram
+++ b/Tools/peg_generator/pegen/metagrammar.gram
@@ -84,7 +84,7 @@ items[NamedItemList]:
     | named_item { [named_item] }
 
 named_item[NamedItem]:
-    | NAME '[' type=NAME '*' ']' '=' ~ item {NamedItem(name.string, item, f"{type.string}*")}
+    | NAME '[' type=NAME '*' ']' '=' ~ item {NamedItem(name.string, item, type.string+"*")}
     | NAME '[' type=NAME ']' '=' ~ item {NamedItem(name.string, item, type.string)}
     | NAME '=' ~ item {NamedItem(name.string, item)}
     | item {NamedItem(None, item)}