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-rw-r--r--include/ruby/backward.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/ruby/backward.h b/include/ruby/backward.h
index 4574cb98da..5fe88a2725 100644
--- a/include/ruby/backward.h
+++ b/include/ruby/backward.h
@@ -17,4 +17,9 @@ ruby_show_copyright_to_die(int exitcode)
(exit(ruby_show_copyright_to_die(EXIT_SUCCESS)))
#endif
+#ifdef RUBY_INTEGER_UNIFICATION
+# define rb_cFixnum rb_cInteger
+# define rb_cBignum rb_cInteger
+#endif
+
#endif /* RUBY_RUBY_BACKWARD_H */