diff --git a/os/hal/include/usb.h b/os/hal/include/usb.h
index a99b9f511..d6b2c7cb4 100644
--- a/os/hal/include/usb.h
+++ b/os/hal/include/usb.h
@@ -69,6 +69,7 @@
 #define USB_DESCRIPTOR_DEVICE_QUALIFIER     6
 #define USB_DESCRIPTOR_OTHER_SPEED_CFG      7
 #define USB_DESCRIPTOR_INTERFACE_POWER      8
+#define USB_DESCRIPTOR_INTERFACE_ASSOCIATION 11
 
 #define USB_FEATURE_ENDPOINT_HALT           0
 #define USB_FEATURE_DEVICE_REMOTE_WAKEUP    1