diff --git a/lib/python/pyflyby/_parse.py b/lib/python/pyflyby/_parse.py
index 6ee6730f..263c7717 100644
--- a/lib/python/pyflyby/_parse.py
+++ b/lib/python/pyflyby/_parse.py
@@ -19,7 +19,6 @@
 from   pyflyby._log             import logger
 from   pyflyby._util            import cached_attribute, cmp
 
-from ast import Bytes
 
 from ast import TypeIgnore, AsyncFunctionDef
 
@@ -42,8 +41,17 @@ def _is_ast_str_or_byte(node) -> bool:
     utility function that test if node is an ast.Str|ast.Bytes in Python < 3.12,
     and if it is a ast.Constant, with node.value being a str in newer version.
     """
-    return isinstance(node, Bytes) or _is_ast_str(node)
+    return _is_ast_str(node) or _is_ast_bytes(node)
 
+def _is_ast_bytes(node) -> bool:
+    """
+    utility function that test if node is an ast.Str in Python < 3.12,
+    and if it is a ast.Constant, with node.value being a str in newer version.
+    """
+    if sys.version_info < (3,12):
+        return isinstance(node, ast.Bytes)
+    else:
+        return (isinstance(node, ast.Constant) and isinstance(node.value , bytes))
 
 
 def _is_ast_str(node) -> bool: