From 04be8e84db1cf4f8b2a7bc7679eda4336da75d43 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Fri, 27 Aug 2021 10:52:02 +0900
Subject: Use C99-defined macros to classify a floating-point number

---
 bignum.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'bignum.c')

diff --git a/bignum.c b/bignum.c
index c954fe6755..939b33ca45 100644
--- a/bignum.c
+++ b/bignum.c
@@ -5382,7 +5382,7 @@ rb_integer_float_eq(VALUE x, VALUE y)
     double yd = RFLOAT_VALUE(y);
     double yi, yf;
 
-    if (isnan(yd) || isinf(yd))
+    if (!isfinite(yd))
         return Qfalse;
     yf = modf(yd, &yi);
     if (yf != 0)
-- 
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