diff --git a/initramfs-tools/qubes_vm b/initramfs-tools/qubes_vm
index e12baf6..3a0b7d4 100755
--- a/initramfs-tools/qubes_vm
+++ b/initramfs-tools/qubes_vm
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-if grep -q control_d /proc/xen/capabilities; then
+if grep -q '^[0-]*$' /sys/hypervisor/uuid; then
     echo "Not intended for dom0"
     exit 0
 fi