diff --git a/Lib/lib2to3/refactor.py b/Lib/lib2to3/refactor.py
index d4af8347812..3f4246073a0 100644
--- a/Lib/lib2to3/refactor.py
+++ b/Lib/lib2to3/refactor.py
@@ -564,7 +564,9 @@ def parse_block(self, block, lineno, indent):
         This is necessary to get correct line number / offset information
         in the parser diagnostics and embedded into the parse tree.
         """
-        return self.driver.parse_tokens(self.wrap_toks(block, lineno, indent))
+        tree = self.driver.parse_tokens(self.wrap_toks(block, lineno, indent))
+        tree.future_features = frozenset()
+        return tree
 
     def wrap_toks(self, block, lineno, indent):
         """Wraps a tokenize stream to systematically modify start/end."""