Index: uspace/lib/pcm/src/format.c
===================================================================
--- uspace/lib/pcm/src/format.c	(revision b1dfe130f588aa94da97a7dffd925e164fc597c9)
+++ uspace/lib/pcm/src/format.c	(revision 18bb1983592d82d44c5be98e815382d3a694e726)
@@ -170,5 +170,5 @@
  * @return Error code.
  */
-int pcm_format_mix(void *dst, const void *src, size_t size, const pcm_format_t *f)
+errno_t pcm_format_mix(void *dst, const void *src, size_t size, const pcm_format_t *f)
 {
 	return pcm_format_convert_and_mix(dst, size, src, size, f, f);
@@ -188,5 +188,5 @@
  * If there are not enough data in the source buffer silent data is assumed.
  */
-int pcm_format_convert_and_mix(void *dst, size_t dst_size, const void *src,
+errno_t pcm_format_convert_and_mix(void *dst, size_t dst_size, const void *src,
     size_t src_size, const pcm_format_t *sf, const pcm_format_t *df)
 {