1 files changed, 1 insertions, 1 deletions
diff --git a/random.c b/random.c
index 8f8a7f33a8..cb5fd57822 100644
--- a/random.c
+++ b/random.c
@@ -1435,7 +1435,7 @@ Init_RandomSeed2(void)
     VALUE seed = default_rand.seed;
 
     if (RB_TYPE_P(seed, T_BIGNUM)) {
-	RBASIC(seed)->klass = rb_cBignum;
+	rb_obj_reveal(seed, rb_cBignum);
     }
 }