diff --git a/stripe/_error_object.py b/stripe/_error_object.py
index cd30fc325..f3556b019 100644
--- a/stripe/_error_object.py
+++ b/stripe/_error_object.py
@@ -13,7 +13,7 @@
 
 class ErrorObject(StripeObject):
     charge: Optional[str]
-    code: int
+    code: Optional[str]
     decline_code: Optional[str]
     doc_url: Optional[str]
     message: Optional[str]