diff --git a/include/xen/interface/xen.h b/include/xen/interface/xen.h
index 518a5bf79ed3..87ad143be406 100644
--- a/include/xen/interface/xen.h
+++ b/include/xen/interface/xen.h
@@ -58,6 +58,16 @@
 #define __HYPERVISOR_physdev_op           33
 #define __HYPERVISOR_hvm_op               34
 
+/* Architecture-specific hypercall definitions. */
+#define __HYPERVISOR_arch_0               48
+#define __HYPERVISOR_arch_1               49
+#define __HYPERVISOR_arch_2               50
+#define __HYPERVISOR_arch_3               51
+#define __HYPERVISOR_arch_4               52
+#define __HYPERVISOR_arch_5               53
+#define __HYPERVISOR_arch_6               54
+#define __HYPERVISOR_arch_7               55
+
 /*
  * VIRTUAL INTERRUPTS
  *