*** mp/mp_fopen.c.orig	Wed Dec 31 19:00:00 1969
--- mp/mp_fopen.c	Mon Dec 21 11:12:23 1998
***************
*** 177,182 ****
--- 177,186 ----
  
  		last_pgno = mbytes * (MEGABYTE / pagesize);
  		last_pgno += bytes / pagesize;
+ 
+ 		/* Correction: page numbers are zero-based, not 1-based. */
+ 		if (last_pgno != 0)
+ 			--last_pgno;
  
  		/*
  		 * Get the file id if we weren't given one.  Generated file id's