Index: uspace/lib/bithenge/src/file.c
===================================================================
--- uspace/lib/bithenge/src/file.c	(revision cecba66ea48d60cfa59865e98aeda663808e42c7)
+++ uspace/lib/bithenge/src/file.c	(revision 82d515e917f3eeeff253e4aa30e493f5f632c950)
@@ -77,6 +77,7 @@
 		return ELIMIT;
 
-	ssize_t amount_read = vfs_read(blob->fd, &offset, buffer, *size);
-	if (amount_read < 0)
+	size_t amount_read;
+	int rc = vfs_read(blob->fd, &offset, buffer, *size, &amount_read);
+	if (rc != EOK)
 		return errno;
 	*size += amount_read;