1 files changed, 1 insertions, 1 deletions
diff --git a/numeric.c b/numeric.c
index 1e971f41ea..2fdfaafda0 100644
--- a/numeric.c
+++ b/numeric.c
@@ -1488,7 +1488,7 @@ flo_is_finite_p(VALUE num)
 {
     double value = RFLOAT_VALUE(num);
 
-#if HAVE_ISFINITE
+#ifdef HAVE_ISFINITE
     if (!isfinite(value))
 	return Qfalse;
 #else