diff --git a/src/ape/api/transactions.py b/src/ape/api/transactions.py
index 7ad7e737a6..446e0efd25 100644
--- a/src/ape/api/transactions.py
+++ b/src/ape/api/transactions.py
@@ -96,7 +96,7 @@ def validate_gas_limit(cls, value):
         return value
 
     @property
-    def gas(self) -> int:
+    def gas(self) -> Optional[int]:
         """
         Alias for ``.gas_limit``.
         """