diff --git a/Demos/Device/ClassDriver/GenericHID/HostTestApp/test_generic_hid_libusb.py b/Demos/Device/ClassDriver/GenericHID/HostTestApp/test_generic_hid_libusb.py
index 8da8ad7673..de700147e0 100755
--- a/Demos/Device/ClassDriver/GenericHID/HostTestApp/test_generic_hid_libusb.py
+++ b/Demos/Device/ClassDriver/GenericHID/HostTestApp/test_generic_hid_libusb.py
@@ -14,7 +14,7 @@
     pattern on the target board. Send and received report data is printed to
     the terminal.
 
-    Requires the PyUSB library (http://sourceforge.net/apps/trac/pyusb/).
+    Requires PyUSB >= 1.0.0 (https://github.com/pyusb/pyusb).
 """
 
 import sys
@@ -71,8 +71,8 @@ def main():
 
     print("Connected to device 0x%04X/0x%04X - %s [%s]" %
           (hid_device.idVendor, hid_device.idProduct,
-           usb.util.get_string(hid_device, 256, hid_device.iProduct),
-           usb.util.get_string(hid_device, 256, hid_device.iManufacturer)))
+           usb.util.get_string(hid_device, hid_device.iProduct),
+           usb.util.get_string(hid_device, hid_device.iManufacturer)))
 
     p = 0
     while (True):
diff --git a/Demos/Device/LowLevel/BulkVendor/HostTestApp/test_bulk_vendor.py b/Demos/Device/LowLevel/BulkVendor/HostTestApp/test_bulk_vendor.py
index 8e54c7c370..f6f5c5f339 100644
--- a/Demos/Device/LowLevel/BulkVendor/HostTestApp/test_bulk_vendor.py
+++ b/Demos/Device/LowLevel/BulkVendor/HostTestApp/test_bulk_vendor.py
@@ -11,7 +11,7 @@
     receive a continuous stream of packets to/from to the device, to show
     bidirectional communications.
 
-    Requires the pyUSB library (http://sourceforge.net/projects/pyusb/).
+    Requires PyUSB >= 1.0.0 (https://github.com/pyusb/pyusb).
 """
 
 import sys
@@ -53,8 +53,8 @@ def main():
 
     print("Connected to device 0x%04X/0x%04X - %s [%s]" %
           (vendor_device.idVendor, vendor_device.idProduct,
-           usb.util.get_string(vendor_device, 255, vendor_device.iProduct),
-           usb.util.get_string(vendor_device, 255, vendor_device.iManufacturer)))
+           usb.util.get_string(vendor_device, vendor_device.iProduct),
+           usb.util.get_string(vendor_device, vendor_device.iManufacturer)))
 
     x = 0
     while 1: