diff --git a/pkg/hostman/guestman/qemu/generate.go b/pkg/hostman/guestman/qemu/generate.go
index 761ebdd13a..dc79f4d5fd 100644
--- a/pkg/hostman/guestman/qemu/generate.go
+++ b/pkg/hostman/guestman/qemu/generate.go
@@ -372,7 +372,8 @@ func GetNicAddr(index int, disksLen int, isoDevsLen int, isVdiSpice bool) int {
 }
 
 func GetDiskAddr(idx int, isVdiSpice bool) int {
-	var base = 5
+	// host-bridge / isa-bridge / vga / serial / network / block / usb / rng
+	var base = 7
 	if isVdiSpice {
 		base += 10
 	}