diff --git a/mkosi/config.py b/mkosi/config.py
index a2a0fb1e..d33e20e8 100644
--- a/mkosi/config.py
+++ b/mkosi/config.py
@@ -1920,6 +1920,7 @@ class Config:
     qemu_args: list[str]
 
     image: Optional[str]
+    devicetree: Optional[Path] = None
 
     def name(self) -> str:
         return self.image or self.image_id or "default"