diff --git a/pytiled_parser/layer.py b/pytiled_parser/layer.py
index 3ce20f7..1286796 100644
--- a/pytiled_parser/layer.py
+++ b/pytiled_parser/layer.py
@@ -35,10 +35,10 @@ class Layer:
     """
 
     name: str
-    height: int
-    width: int
 
     id: Optional[int] = None
+    width: Optional[int] = 0
+    height: Optional[int] = 0
     offset: Optional[OrderedPair] = None
     opacity: Optional[float] = 1
     properties: Optional[properties_.Properties] = None