Index: uspace/lib/c/include/io/kio.h
===================================================================
--- uspace/lib/c/include/io/kio.h	(revision 09d13c8e567316acfec91989df4a5d961f8fb644)
+++ uspace/lib/c/include/io/kio.h	(revision b2e121ad525328882607c97cdba1a9ded6137d13)
@@ -39,4 +39,6 @@
 #include <stdarg.h>
 #include <io/verify.h>
+#include <_bits/errno.h>
+#include <_bits/size_t.h>
 
 extern errno_t kio_write(const void *, size_t, size_t *);