Index: uspace/lib/usbdev/src/altiface.c
===================================================================
--- uspace/lib/usbdev/src/altiface.c	(revision 585635856440deab73ad5891daab8fa87901aa68)
+++ uspace/lib/usbdev/src/altiface.c	(revision be39fc6933dcee0f4da8cad1a1eb341979fbb8ce)
@@ -39,4 +39,5 @@
 #include <errno.h>
 #include <stdlib.h>
+#include <stddef.h>
 
 /** Count number of alternate settings of a interface.
Index: uspace/lib/usbdev/src/dp.c
===================================================================
--- uspace/lib/usbdev/src/dp.c	(revision 585635856440deab73ad5891daab8fa87901aa68)
+++ uspace/lib/usbdev/src/dp.c	(revision be39fc6933dcee0f4da8cad1a1eb341979fbb8ce)
@@ -48,4 +48,5 @@
 #include <stdlib.h>
 #include <stdbool.h>
+#include <stddef.h>
 #include <sys/types.h>