diff --git a/tasks/task_autodetect.c b/tasks/task_autodetect.c
index 163b5fc8bc..09b0ee76c5 100644
--- a/tasks/task_autodetect.c
+++ b/tasks/task_autodetect.c
@@ -71,7 +71,7 @@ const GUID GUID_NULL = {0, 0, 0, {0, 0, 0, 0, 0, 0, 0, 0}};
 /* HID Class-Specific Requests values. See section 7.2 of the HID specifications */
 #define USB_HID_GET_REPORT 0x01
 #define USB_CTRL_IN LIBUSB_ENDPOINT_IN|LIBUSB_REQUEST_TYPE_CLASS|LIBUSB_RECIPIENT_INTERFACE
-#define USB_PACKET_CTRL_LEN 64
+#define USB_PACKET_CTRL_LEN 5
 #define USB_TIMEOUT 5000 /* timeout in ms */
 
 /* only one blissbox per machine is currently supported */