1 files changed, 1 insertions, 1 deletions
diff --git a/bignum.c b/bignum.c
index 685f9b80c1..d30f89eff4 100644
--- a/bignum.c
+++ b/bignum.c
@@ -176,7 +176,7 @@ bignew_1(VALUE klass, long len, int sign)
 	RBIGNUM(big)->as.heap.digits = ALLOC_N(BDIGIT, len);
 	RBIGNUM(big)->as.heap.len = len;
     }
-
+    OBJ_FREEZE(big);
     return (VALUE)big;
 }