diff --git a/sys/dev/usb/uplcom.c b/sys/dev/usb/uplcom.c
index 715fa72295ba..9e853c200894 100644
--- a/sys/dev/usb/uplcom.c
+++ b/sys/dev/usb/uplcom.c
@@ -231,6 +231,8 @@ static const struct uplcom_product {
 	{ USB_VENDOR_IODATA, USB_PRODUCT_IODATA_USBRSAQ, -1, TYPE_PL2303 },
 	/* I/O DATA USB-RSAQ2 */
 	{ USB_VENDOR_PROLIFIC, USB_PRODUCT_PROLIFIC_RSAQ2, -1, TYPE_PL2303 },
+	/* I/O DATA USB-RSAQ3 */
+	{ USB_VENDOR_PROLIFIC, USB_PRODUCT_PROLIFIC_RSAQ3, -1, TYPE_PL2303X },
 	/* PLANEX USB-RS232 URS-03 */
 	{ USB_VENDOR_ATEN, USB_PRODUCT_ATEN_UC232A, -1, TYPE_PL2303 },
 	/* ST Lab USB-SERIAL-4 */
diff --git a/sys/dev/usb/usbdevs b/sys/dev/usb/usbdevs
index e174295dd6f5..6a1b00e46c3f 100644
--- a/sys/dev/usb/usbdevs
+++ b/sys/dev/usb/usbdevs
@@ -1315,6 +1315,7 @@ product PROLIFIC PL2303		0x2303	PL2303 Serial (ATEN/IOGEAR UC232A)
 product PROLIFIC PL2305		0x2305	Parallel printer
 product PROLIFIC ATAPI4		0x2307	ATAPI-4 Controller
 product PROLIFIC PL2501		0x2501	PL2501 Host-Host interface
+product PROLIFIC RSAQ3		0xaaa2	PL2303 Serial adapter (IODATA USB-RSAQ3)
 
 /* Putercom products */
 product PUTERCOM UPA100		0x047e	USB-1284 BRIDGE