Index: uspace/app/mkfat/mkfat.c
===================================================================
--- uspace/app/mkfat/mkfat.c	(revision 991f645937e5e281d6996ad4623f9ab33c71916d)
+++ uspace/app/mkfat/mkfat.c	(revision ff65e919e94df2ad211a3d64817421d7d652ca8c)
@@ -144,5 +144,5 @@
 	}
 
-	rc = block_init(handle, 2048);
+	rc = block_init(EXCHANGE_SERIALIZE, handle, 2048);
 	if (rc != EOK)  {
 		printf(NAME ": Error initializing libblock.\n");