--- adventure/crc.c.orig	2003-12-17 03:47:37.000000000 +0100

+++ adventure/crc.c	2011-06-06 12:11:57.284547083 +0200

@@ -131,6 +131,7 @@

 					step = 0;

 			}

 			crcval = (crcval << 8) ^ crctab[i];

+			crcval &= 0xffffffff;	/* Mask to 32 bits. */

 		}

-	return crcval & 0xffffffff;	/* Mask to 32 bits. */

+	return crcval;

 }