diff --git a/vyper/venom/effects.py b/vyper/venom/effects.py
index a668ff5439..97cffe2cb2 100644
--- a/vyper/venom/effects.py
+++ b/vyper/venom/effects.py
@@ -68,6 +68,8 @@ def __iter__(self):
     "balance": BALANCE,
     "selfbalance": BALANCE,
     "extcodecopy": EXTCODE,
+    "extcodesize": EXTCODE,
+    "extcodehash": EXTCODE,
     "selfdestruct": BALANCE,  # may modify code, but after the transaction
     "log": MEMORY,
     "revert": MEMORY,