diff --git a/unwind/db.py b/unwind/db.py
index 99839cb..e322238 100644
--- a/unwind/db.py
+++ b/unwind/db.py
@@ -225,6 +225,10 @@ async def get_all(model: Type[ModelType], **kwds) -> Iterable[ModelType]:
 
 
 async def update(item):
+    # Support late initializing - used for optimization.
+    if getattr(item, "_is_lazy", False):
+        item._lazy_init()
+
     values = asplain(item)
     keys = ", ".join(f"{k}=:{k}" for k in values if k != "id")
     query = f"UPDATE {item._table} SET {keys} WHERE id=:id"