Index: head/sys/kern/vfs_export.c
===================================================================
--- head/sys/kern/vfs_export.c
+++ head/sys/kern/vfs_export.c
@@ -412,7 +412,7 @@
 	 * If an indexfile was specified, pull it in.
 	 */
 	if (argp->ex_indexfile != NULL) {
-		if (nfs_pub.np_index != NULL)
+		if (nfs_pub.np_index == NULL)
 			nfs_pub.np_index = malloc(MAXNAMLEN + 1, M_TEMP,
 			    M_WAITOK);
 		error = copyinstr(argp->ex_indexfile, nfs_pub.np_index,