Index: uspace/lib/gui/window.h
===================================================================
--- uspace/lib/gui/window.h	(revision 78188e5873f47aad1ea0bb8b9e68b6f694b89dc4)
+++ uspace/lib/gui/window.h	(revision da9d6cae9d1c35542e015f3d2826946a83fef587)
@@ -78,5 +78,5 @@
 
 /** Change window caption. */
-extern int window_set_caption(window_t *, const char *);
+extern errno_t window_set_caption(window_t *, const char *);
 
 /**