Index: uspace/lib/pcm/src/format.c
===================================================================
--- uspace/lib/pcm/src/format.c	(revision 5cbccd4acbdbb068412b7105503d09315968f2a2)
+++ uspace/lib/pcm/src/format.c	(revision 3b60ea0ab63232b82cbb39069c74d417545a98e6)
@@ -165,5 +165,5 @@
  * @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);
@@ -183,5 +183,5 @@
  * 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)
 {