diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index f702199..a8ebafc 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -430,4 +430,5 @@
 {
 	smp_ops = xen_smp_ops;
 	xen_fill_possible_map();
+	paravirt_use_bytelocks();
 }