Index: uspace/srv/fs/fat/fat_ops.c
===================================================================
--- uspace/srv/fs/fat/fat_ops.c	(revision 00a9625f936cdfac84ac5fd0d5b2f0528fbd99d2)
+++ uspace/srv/fs/fat/fat_ops.c	(revision b713492b95a6ecaf1c68c1954fa52bbcbfc39907)
@@ -462,5 +462,5 @@
 	 * We need to grow the parent in order to create a new unused dentry.
 	 */
-	if (parentp->idx->pfc == FAT_CLST_ROOT) {
+	if (parentp->firstc == FAT_CLST_ROOT) {
 		/* Can't grow the root directory. */
 		fibril_mutex_unlock(&parentp->idx->lock);