diff --git a/drivers/net/sfc/net_driver.h b/drivers/net/sfc/net_driver.h
index 18b21ef..a84f975 100644
--- a/drivers/net/sfc/net_driver.h
+++ b/drivers/net/sfc/net_driver.h
@@ -686,7 +686,7 @@
 	struct workqueue_struct *workqueue;
 	struct work_struct reset_work;
 	struct delayed_work monitor_work;
-	unsigned long membase_phys;
+	resource_size_t membase_phys;
 	void __iomem *membase;
 	spinlock_t biu_lock;
 	enum efx_int_mode interrupt_mode;