Index: uspace/srv/fs/fat/fat_fat.c
===================================================================
--- uspace/srv/fs/fat/fat_fat.c	(revision 890793bb6b874641ead0bdd471465d6453f7fb10)
+++ uspace/srv/fs/fat/fat_fat.c	(revision abd36f734cd40e6697ac37de17daa3fb8d7523eb)
@@ -183,5 +183,5 @@
 
 	/* zero out already allocated space */
-	for (o = nodep->size - 1; o < pos && o < boundary;
+	for (o = nodep->size; o < pos && o < boundary;
 	    o = ALIGN_DOWN(o + bps, bps)) {
 	    	int flags = (o % bps == 0) ?