Index: uspace/lib/libc/generic/devmap.c
===================================================================
--- uspace/lib/libc/generic/devmap.c	(revision 953769ff5f13f913fbf03e6f1b8aac2f414094f6)
+++ uspace/lib/libc/generic/devmap.c	(revision 553492bee0faefb2eb530f9618a7ad57db2d179c)
@@ -194,5 +194,5 @@
 	if (retval != EOK) {
 		if (handle != NULL)
-			*handle = -1;
+			*handle = (dev_handle_t) -1;
 		return retval;
 	}