diff --git a/arch/x86/xen/xen-head.S b/arch/x86/xen/xen-head.S
index 1cf94caa7600..565708675b2f 100644
--- a/arch/x86/xen/xen-head.S
+++ b/arch/x86/xen/xen-head.S
@@ -110,8 +110,8 @@ SYM_FUNC_START(xen_hypercall_hvm)
 	pop %ebx
 	pop %eax
 #else
-	lea xen_hypercall_amd(%rip), %rbx
-	cmp %rax, %rbx
+	lea xen_hypercall_amd(%rip), %rcx
+	cmp %rax, %rcx
 #ifdef CONFIG_FRAME_POINTER
 	pop %rax	/* Dummy pop. */
 #endif