diff --git a/chaotic/chaotic/front/types.py b/chaotic/chaotic/front/types.py
index 2530a6b10a1e..7713fbd91e31 100644
--- a/chaotic/chaotic/front/types.py
+++ b/chaotic/chaotic/front/types.py
@@ -304,7 +304,7 @@ def visit_children(self, cb: Callable[[Schema, Schema], None]) -> None:
 @dataclasses.dataclass
 class SchemaObjectRaw:
     type: str
-    additionalProperties: Any
+    additionalProperties: Any = False
     properties: Optional[dict] = None
     required: Optional[List[str]] = None
     nullable: bool = False