diff --git a/targets/x86-kvm_guest/config b/targets/x86-kvm_guest/config
index a92fa472136b068e85bdf0db28fc3a31ab801a9a..75fa40624a40efedffa6e4ab5432f01fd0c58eed 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"