diff --git a/ResponseCode.h b/ResponseCode.h
index 567b7a8..cdb4a79 100644
--- a/ResponseCode.h
+++ b/ResponseCode.h
@@ -70,6 +70,7 @@
     static const int DiskSizeChanged = 641;
     static const int DiskLabelChanged = 642;
     static const int DiskVolumeCreated = 643;
+    static const int DiskVolumeDestroyed = 644;
     static const int DiskDestroyed = 649;
 
     static const int VolumeCreated = 650;