diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c
index a60b8cd40198da8d6eb06640a01b73906e774a68..5b92c290e6c6e99dccb24a45cb76d81bfd23e6a8 100644
--- a/drivers/ata/libahci_platform.c
+++ b/drivers/ata/libahci_platform.c
@@ -426,7 +426,7 @@ int ahci_platform_init_host(struct platform_device *pdev,
 	}
 
 	/* prepare host */
-	pi.private_data = (void *)hpriv->flags;
+	pi.private_data = (void *)(unsigned long)hpriv->flags;
 
 	ahci_save_initial_config(dev, hpriv);