Use C99-defined macros to classify a floating-point number

1 files changed, 1 insertions, 1 deletions

diff --git a/random.c b/random.c
index 5663f87be2..232fe3e6f5 100644
--- a/random.c
+++ b/random.c
@@ -1348,7 +1348,7 @@ static inline double
 float_value(VALUE v)
 {
     double x = RFLOAT_VALUE(v);
-    if (isinf(x) || isnan(x)) {
+    if (!isfinite(x)) {
 	domain_error();
     }
     return x;