--- bsd-games-2.13/adventure/crc.c~	1999-04-04 12:49:03.000000000 +0100
+++ bsd-games-2.13/adventure/crc.c	2005-01-07 02:42:07.027698064 +0000
@@ -134,7 +134,8 @@
 				if (step >= sizeof(crctab) / sizeof(crctab[0]))
 					step = 0;
 			}
-			crcval = (crcval << 8) ^ crctab[i];
+			/* Mask to 32 bits. */
+			crcval = ((crcval << 8) ^ crctab[i]) & 0xffffffff;
 		}
-	return crcval & 0xffffffff;	/* Mask to 32 bits. */
+	return crcval;
 }