diff --git a/VolumeBase.h b/VolumeBase.h
index 1494c2c..e7c7836 100644
--- a/VolumeBase.h
+++ b/VolumeBase.h
@@ -75,6 +75,8 @@
         kUnmounting,
         /* Next states: mounting, formatting */
         kUnmountable,
+        /* Next states: none */
+        kRemoved,
     };
 
     const std::string& getId() { return mId; }