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-rw-r--r--ext/bigdecimal/bigdecimal.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/ext/bigdecimal/bigdecimal.h b/ext/bigdecimal/bigdecimal.h
index fcfeb9c3c3..6182ae2374 100644
--- a/ext/bigdecimal/bigdecimal.h
+++ b/ext/bigdecimal/bigdecimal.h
@@ -9,6 +9,8 @@
#ifndef RUBY_BIG_DECIMAL_H
#define RUBY_BIG_DECIMAL_H 1
+#define RUBY_NO_OLD_COMPATIBILITY
+
#include "ruby/ruby.h"
#include <float.h>