--- nagios-plugins-1.4.15/plugins/check_disk.c	2010-07-27 22:47:16.000000000 +0200
+++ check_disk.c	2012-06-05 21:17:26.650825165 +0200
@@ -314,6 +314,7 @@
         me->me_mountdir, total, available, available_to_root, used, fsp.fsu_files, fsp.fsu_ffree);
 
       dused_pct = calculate_percent( used, used + available );	/* used + available can never be > uintmax */
+      total = used + available;
 
       dfree_pct = 100 - dused_pct;
       dused_units = used*fsp.fsu_blocksize/mult;