diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 8310ca0..f702199 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -69,6 +69,7 @@
 	preempt_disable();
 
 	xen_enable_sysenter();
+	xen_enable_syscall();
 
 	cpu = smp_processor_id();
 	smp_store_cpu_info(cpu);