diff --git a/lithic/_models.py b/lithic/_models.py
index abd35df6..6c756a1b 100644
--- a/lithic/_models.py
+++ b/lithic/_models.py
@@ -27,7 +27,7 @@ def construct(cls: Type[ModelT], _fields_set: set[str] | None = None, **values:
                 key = name
 
             if key in values:
-                if values[key] is None and not field.required:
+                if values[key] is None:
                     fields_values[name] = field.get_default()
                 else:
                     if not is_literal_type(field.type_) and (