diff --git a/protect/control/v1/common.proto b/protect/control/v1/common.proto
index cad2d1b..18ceb99 100644
--- a/protect/control/v1/common.proto
+++ b/protect/control/v1/common.proto
@@ -129,6 +129,7 @@ enum ZoneVirtualizationBackend {
   ZONE_VIRTUALIZATION_BACKEND_PV = 1;
   ZONE_VIRTUALIZATION_BACKEND_PVH = 2;
   ZONE_VIRTUALIZATION_BACKEND_AUTOMATIC = 3;
+  ZONE_VIRTUALIZATION_BACKEND_KVM = 4;
 }
 
 // Strategy used when expanding the selected node set beyond the seed node.