diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index 9ec1a49..767000c 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -50,7 +50,7 @@
 	char		*buf_put;
 };
 
-static struct usb_device_id id_table [] = {
+static const struct usb_device_id id_table[] = {
 	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
 	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
 	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },