diff --git a/components/usb/include/usb/usb_types_ch9.h b/components/usb/include/usb/usb_types_ch9.h
index f54f94842a0..a1214324fd2 100644
--- a/components/usb/include/usb/usb_types_ch9.h
+++ b/components/usb/include/usb/usb_types_ch9.h
@@ -384,7 +384,7 @@ ESP_STATIC_ASSERT(sizeof(usb_config_desc_t) == USB_CONFIG_DESC_SIZE, "Size of us
 /**
  * @brief Size of a USB interface association descriptor in bytes
  */
-#define USB_IAD_DESC_SIZE    9
+#define USB_IAD_DESC_SIZE    8
 
 /**
  * @brief Structure representing a USB interface association descriptor