diff --git a/vyper/compiler/phases.py b/vyper/compiler/phases.py
index 850adcfea3..76b88d241b 100644
--- a/vyper/compiler/phases.py
+++ b/vyper/compiler/phases.py
@@ -71,6 +71,8 @@ class CompilerData:
         Runtime bytecode
     """
 
+    experimental_codegen: bool = False
+
     def __init__(
         self,
         file_input: FileInput | str,