Index: uspace/lib/usb/include/usb/debug.h
===================================================================
--- uspace/lib/usb/include/usb/debug.h	(revision 00db345ac0b5fb5841cf7eaac2d0a1eba5487690)
+++ uspace/lib/usb/include/usb/debug.h	(revision 1efe89b1e7ca890cc3565fca0d6e6e03e52481e1)
@@ -79,5 +79,5 @@
 	usb_log_printf(USB_LOG_LEVEL_DEBUG2, format, ##__VA_ARGS__)
 
-const char *usb_debug_str_buffer(uint8_t *, size_t, size_t);
+const char *usb_debug_str_buffer(const uint8_t *, size_t, size_t);
 
 
Index: uspace/lib/usb/src/debug.c
===================================================================
--- uspace/lib/usb/src/debug.c	(revision 00db345ac0b5fb5841cf7eaac2d0a1eba5487690)
+++ uspace/lib/usb/src/debug.c	(revision 1efe89b1e7ca890cc3565fca0d6e6e03e52481e1)
@@ -281,5 +281,5 @@
  * @return Dumped buffer as a static (but fibril local) string.
  */
-const char *usb_debug_str_buffer(uint8_t *buffer, size_t size,
+const char *usb_debug_str_buffer(const uint8_t *buffer, size_t size,
     size_t dumped_size)
 {