diff --git a/include/asm-x86/xen/hypercall.h b/include/asm-x86/xen/hypercall.h
index 25366641f3f8ab27aec02f5dc0187c22a194b743..d9e4cf7b23ac76d650495f39658df3fa94fca4b5 100644
--- a/include/asm-x86/xen/hypercall.h
+++ b/include/asm-x86/xen/hypercall.h
@@ -388,6 +388,14 @@ HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args)
 	return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args);
 }
 
+#ifdef CONFIG_X86_64
+static inline int
+HYPERVISOR_set_segment_base(int reg, unsigned long value)
+{
+	return _hypercall2(int, set_segment_base, reg, value);
+}
+#endif
+
 static inline int
 HYPERVISOR_suspend(unsigned long srec)
 {