diff --git a/spice/vd_agent.h b/spice/vd_agent.h
index ec2ef27..2b9884e 100644
--- a/spice/vd_agent.h
+++ b/spice/vd_agent.h
@@ -38,6 +38,7 @@
 enum {
     VDP_CLIENT_PORT = 1,
     VDP_SERVER_PORT,
+    VDP_END_PORT
 };
 
 typedef struct SPICE_ATTR_PACKED VDIChunkHeader {