diff --git a/construct_typed/dataclass_struct.py b/construct_typed/dataclass_struct.py
index 78d2e59..d13f017 100644
--- a/construct_typed/dataclass_struct.py
+++ b/construct_typed/dataclass_struct.py
@@ -107,6 +107,7 @@ def csfield(
         if callable(default_subcon.value):
             default = None  # context lambda is only defined at parsing/building
         else:
+            init = True
             default = default_subcon.value
 
     return t.cast(
@@ -269,4 +270,4 @@ TBitStruct = DataclassBitStruct
 TContainerMixin = DataclassMixin
 TContainerBase = DataclassMixin
 TStructField = csfield
-sfield = csfield
\ No newline at end of file
+sfield = csfield