diff --git a/firmware/application/usb_serial_descriptor.c b/firmware/application/usb_serial_descriptor.c
index aff13e58b..3b7dd96b4 100644
--- a/firmware/application/usb_serial_descriptor.c
+++ b/firmware/application/usb_serial_descriptor.c
@@ -118,7 +118,7 @@ uint8_t usb_descriptor_configuration_full_speed[] = {
     USB_INT_IN_EP_ADDR,            // bEndpointAddress
     0x03,                          // bmAttributes: BULK
     USB_WORD(16),                  // wMaxPacketSize
-    0xFF,                          // bInterval: no NAK
+    0x20,                          // bInterval: no NAK
 
     9,                              // bLength
     USB_DESCRIPTOR_TYPE_INTERFACE,  // bDescriptorType
@@ -203,7 +203,7 @@ uint8_t usb_descriptor_configuration_high_speed[] = {
     USB_INT_IN_EP_ADDR,            // bEndpointAddress
     0x03,                          // bmAttributes: BULK
     USB_WORD(16),                  // wMaxPacketSize
-    0xFF,                          // bInterval: no NAK
+    0x20,                          // bInterval: no NAK
 
     9,                              // bLength
     USB_DESCRIPTOR_TYPE_INTERFACE,  // bDescriptorType