Index: usr.bin/primes/primes.h
===================================================================
--- usr.bin/primes/primes.h
+++ usr.bin/primes/primes.h
@@ -45,7 +45,6 @@
 
 /* ubig is the type that holds a large unsigned value */
 typedef uint64_t ubig;			/* must be >=32 bit unsigned value */
-#define	BIG		ULONG_MAX	/* largest value will sieve */
 
 /* bytes in sieve table (must be > 3*5*7*11) */
 #define	TABSIZE		256*1024
Index: usr.bin/primes/primes.c
===================================================================
--- usr.bin/primes/primes.c
+++ usr.bin/primes/primes.c
@@ -173,7 +173,7 @@
 
 /*
  * read_num_buf --
- *	This routine returns a number n, where 0 <= n && n <= BIG.
+ *	This routine returns a non-negative number n
  */
 static ubig
 read_num_buf(void)
@@ -218,7 +218,7 @@
 	/*
 	 * A number of systems can not convert double values into unsigned
 	 * longs when the values are larger than the largest signed value.
-	 * We don't have this problem, so we can go all the way to BIG.
+	 * We don't have this problem, so we can go all the way.
 	 */
 	if (start < 3) {
 		start = (ubig)2;