diff --git a/test_libs/pyspec/eth2spec/utils/ssz/ssz_typing.py b/test_libs/pyspec/eth2spec/utils/ssz/ssz_typing.py
index 341df880a..6595c966f 100644
--- a/test_libs/pyspec/eth2spec/utils/ssz/ssz_typing.py
+++ b/test_libs/pyspec/eth2spec/utils/ssz/ssz_typing.py
@@ -333,7 +333,7 @@ class Vector(BaseList):
 
     @classmethod
     def default(cls):
-        return [cls.elem_type.default() for _ in range(cls.length)]
+        return cls(cls.elem_type.default() for _ in range(cls.length))
 
     @classmethod
     def is_fixed_size(cls):