Index: uspace/lib/usb/include/usb/debug.h
===================================================================
--- uspace/lib/usb/include/usb/debug.h	(revision ff4185e6f53357568fd755520ab20fa510077b04)
+++ uspace/lib/usb/include/usb/debug.h	(revision 98807e16a5c0772485f4b14788ab3a810e762bbf)
@@ -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 ff4185e6f53357568fd755520ab20fa510077b04)
+++ uspace/lib/usb/src/debug.c	(revision 98807e16a5c0772485f4b14788ab3a810e762bbf)
@@ -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)
 {