1 files changed, 3 insertions, 1 deletions
diff --git a/bignum.c b/bignum.c
index bd9e0c8cae..9fa1f2aab3 100644
--- a/bignum.c
+++ b/bignum.c
@@ -46,8 +46,10 @@ static int
 bigzero_p(VALUE x)
 {
     long i;
+    BDIGIT *ds = BDIGITS(x);
+
     for (i = RBIGNUM_LEN(x) - 1; 0 <= i; i--) {
-	if (BDIGITS(x)[i]) return 0;
+	if (ds[i]) return 0;
     }
     return 1;
 }