1 files changed, 1 insertions, 1 deletions
diff --git a/bignum.c b/bignum.c
index 536094f23a..277923f551 100644
--- a/bignum.c
+++ b/bignum.c
@@ -44,7 +44,7 @@ static int
 bigzero_p(VALUE x)
 {
     long i;
-    for (i = 0; i < RBIGNUM_LEN(x); ++i) {
+    for (i = RBIGNUM_LEN(x) - 1; 0 <= i; i--) {
 	if (BDIGITS(x)[i]) return 0;
     }
     return 1;