Index: uspace/lib/posix/src/stdio.c
===================================================================
--- uspace/lib/posix/src/stdio.c	(revision bc56f30178279e1e59b8add425abe116ecae93b5)
+++ uspace/lib/posix/src/stdio.c	(revision 28a5ebdea900783081bd23e40f685b6b0479c63d)
@@ -249,5 +249,5 @@
  * @return The number of written characters.
  */
-static int _dprintf_wstr_write(const wchar_t *str, size_t size, void *fd)
+static int _dprintf_wstr_write(const char32_t *str, size_t size, void *fd)
 {
 	size_t offset = 0;
@@ -268,5 +268,5 @@
 
 		chars++;
-		offset += sizeof(wchar_t);
+		offset += sizeof(char32_t);
 	}