---
title: kUSBDeviceMaxPacketSize
framework: IOKit
role: symbol
role_heading: Macro
platforms: [Mac Catalyst 13.0+, macOS 10.1+]
path: iokit/kusbdevicemaxpacketsize
---

# kUSBDeviceMaxPacketSize

## Declaration

```occ
#define kUSBDeviceMaxPacketSize
```

## Discussion

Discussion The field in the USB Device Descriptor corresponding to the maximum packet size for endpoint 0