diff --git a/drivers/usb/serial/pl2303.h b/drivers/usb/serial/pl2303.h
index d31f5d2..226997d 100644
--- a/drivers/usb/serial/pl2303.h
+++ b/drivers/usb/serial/pl2303.h
@@ -107,3 +107,8 @@
 /* Corega CG-USBRS232R Serial Adapter */
 #define COREGA_VENDOR_ID	0x07aa
 #define COREGA_PRODUCT_ID	0x002a
+
+/* HL HL-340 (ID: 4348:5523) */
+#define HL340_VENDOR_ID		0x4348
+#define HL340_PRODUCT_ID	0x5523
+