1 files changed, 4 insertions, 1 deletions
diff --git a/bignum.c b/bignum.c
index aba88df04d..d823d9c49a 100644
--- a/bignum.c
+++ b/bignum.c
@@ -2010,11 +2010,14 @@ rb_big_rand(max, rand_buf)
 	return rb_float_new(rand_buf[0]);
     }
     v = bignew(len,1);
+    RBIGNUM(v)->sign = RBIGNUM(max)->sign;
+    len--;
+    BDIGITS(v)[len] = BDIGITS(max)[len] * rand_buf[len];    
     while (len--) {
 	BDIGITS(v)[len] = ((BDIGIT)~0) * rand_buf[len];
     }
 
-    return rb_big_modulo((VALUE)v, max);
+    return v;
 }
 
 /*