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-rw-r--r--include/ruby/missing.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/ruby/missing.h b/include/ruby/missing.h
index e81ad2769d..d12f496c18 100644
--- a/include/ruby/missing.h
+++ b/include/ruby/missing.h
@@ -136,7 +136,7 @@ RUBY_EXTERN double lgamma_r(double, int *);
RUBY_EXTERN double cbrt(double);
#endif
-#if !defined(INFINITY) || !defined(NAN)
+#if !defined(HAVE_INFINITY) || !defined(HAVE_NAN)
union bytesequence4_or_float {
unsigned char bytesequence[4];
float float_value;