diff --git a/compose_viz/service.py b/compose_viz/service.py
index 336bab9..b8cb99a 100644
--- a/compose_viz/service.py
+++ b/compose_viz/service.py
@@ -18,10 +18,10 @@ class Service:
         self._name = name
 
         if image is None and extends is None:
-            raise ValueError(f"Both image and extends are not defined in service '{name}', aborting.")
+            raise AttributeError(f"Both image and extends are not defined in service '{name}', aborting.")
 
         if image is not None and extends is not None:
-            raise ValueError(f"Only one of image and extends can be defined in service '{name}', aborting.")
+            raise AttributeError(f"Only one of image and extends can be defined in service '{name}', aborting.")
 
         self._image = image
         self._ports = ports