diff --git a/usb.c b/usb.c
index b2042e9c4..97a4496b9 100644
--- a/usb.c
+++ b/usb.c
@@ -928,7 +928,7 @@ static struct iio_context * usb_create_context(unsigned int bus,
 
 	pdata->nb_ep_couples = iface->bNumEndpoints / 2;
 
-	IIO_DEBUG("Found %hhu usable i/o endpoint couples\n", pdata->nb_ep_couples);
+	IIO_DEBUG("Found %hu usable i/o endpoint couples\n", pdata->nb_ep_couples);
 
 	pdata->io_endpoints = calloc(pdata->nb_ep_couples,
 			sizeof(*pdata->io_endpoints));