diff --git a/uszipcode/model.py b/uszipcode/model.py
index 17c14f708e..494b92af74 100644
--- a/uszipcode/model.py
+++ b/uszipcode/model.py
@@ -27,7 +27,7 @@ class ZipcodeTypeEnum(enum.Enum):
 
 
 @total_ordering
-class AbstractSimpleZipcode(Base, sam.ExtendedBase):
+class AbstractSimpleZipcode(Base, sam.api.ExtendedBase):
     """
     Base class for Zipcode.
     """