diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index c46b9f2e732f..2aab43a13a8c 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -873,7 +873,7 @@ static void xen_load_sp0(unsigned long sp0)
 static void xen_invalidate_io_bitmap(void)
 {
 	struct physdev_set_iobitmap iobitmap = {
-		.bitmap = 0,
+		.bitmap = NULL,
 		.nr_ports = 0,
 	};