diff --git a/targets/x86-kvm_guest/config b/targets/x86-kvm_guest/config
index a92fa472..75fa4062 100644
--- a/targets/x86-kvm_guest/config
+++ b/targets/x86-kvm_guest/config
@@ -1,2 +1,3 @@
 CONFIG_TARGET_x86=y
 CONFIG_TARGET_x86_kvm_guest=y
+CONFIG_TARGET_ROOTFS_PARTNAME="/dev/vda2"