Index: uspace/lib/usbdev/src/pipesio.c
===================================================================
--- uspace/lib/usbdev/src/pipesio.c	(revision fb4223125c21ea94d51e457ff45fa01295d20a6c)
+++ uspace/lib/usbdev/src/pipesio.c	(revision 2ac7af36711349469ac45032f596e82f306a6537)
@@ -469,6 +469,6 @@
  */
 static int usb_pipe_control_write_no_check(usb_pipe_t *pipe,
-    void *setup_buffer, size_t setup_buffer_size,
-    void *data_buffer, size_t data_buffer_size)
+    const void *setup_buffer, size_t setup_buffer_size,
+    const void *data_buffer, size_t data_buffer_size)
 {
 	/* Ensure serialization over the phone. */
@@ -536,6 +536,6 @@
  */
 int usb_pipe_control_write(usb_pipe_t *pipe,
-    void *setup_buffer, size_t setup_buffer_size,
-    void *data_buffer, size_t data_buffer_size)
+    const void *setup_buffer, size_t setup_buffer_size,
+    const void *data_buffer, size_t data_buffer_size)
 {
 	assert(pipe);