diff --git a/drivers/xen/xen-acpi-pad.c b/drivers/xen/xen-acpi-pad.c
index f23ecf38..da39191e 100644
--- a/drivers/xen/xen-acpi-pad.c
+++ b/drivers/xen/xen-acpi-pad.c
@@ -20,6 +20,7 @@
 #include <acpi/acpi_drivers.h>
 #include <asm/xen/hypercall.h>
 #include <xen/interface/version.h>
+#include <xen/xen-ops.h>
 
 #define ACPI_PROCESSOR_AGGREGATOR_CLASS	"acpi_pad"
 #define ACPI_PROCESSOR_AGGREGATOR_DEVICE_NAME "Processor Aggregator"