diff --git a/confhub/builder.py b/confhub/builder.py
index 0bb2fad..362419f 100644
--- a/confhub/builder.py
+++ b/confhub/builder.py
@@ -35,7 +35,8 @@ def add_field_to_datafiles(field_name: str, field: ConfigurationField, parent_pa
                     current[part] = {}
                 current = current[part]
 
-            current[field_name] = field.get_default_value()
+            if not isinstance(field.data_type, BlockCore):
+                current[field_name] = field.get_default_value()
 
         def process_block(_block: BlockCore, parent_path: List[str]) -> None:
             current_path = parent_path + [_block.__block__]
diff --git a/confhub/core/fields.py b/confhub/core/fields.py
index fb2b7fe..a238b80 100644
--- a/confhub/core/fields.py
+++ b/confhub/core/fields.py
@@ -1,4 +1,4 @@
-from typing import Type
+from typing import Type, Any
 
 from confhub.core.types import DataTypeMapping
 
@@ -19,7 +19,7 @@ def get_default_value(self) -> str:
 
 
 def field(
-        data_type: Type,
+        data_type: Any,
         secret: bool = False,
         filename: str = None
 ) -> ConfigurationField: