diff --git a/virtualizationservice/src/main.rs b/virtualizationservice/src/main.rs
index 22ddf08..0e1e974 100644
--- a/virtualizationservice/src/main.rs
+++ b/virtualizationservice/src/main.rs
@@ -30,6 +30,8 @@
 /// are reserved for the host or other usage.
 const FIRST_GUEST_CID: Cid = 10;
 
+const SYSPROP_LAST_CID: &str = "virtualizationservice.state.last_cid";
+
 const LOG_TAG: &str = "VirtualizationService";
 
 /// The unique ID of a VM used (together with a port number) for vsock communication.