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-rw-r--r--ext/io/console/extconf.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/io/console/extconf.rb b/ext/io/console/extconf.rb
index 79f5838c5e..2f363152e3 100644
--- a/ext/io/console/extconf.rb
+++ b/ext/io/console/extconf.rb
@@ -13,7 +13,7 @@ else
ok = false
end
ok &&= enable_config("io-console-force-compatible-with-1.8") ||
- macro_defined?("HAVE_RUBY_IO_H", "ruby.h")
+ macro_defined?("HAVE_RUBY_IO_H", cpp_include("ruby.h"))
if ok
have_header("sys/ioctl.h")
have_func("rb_check_hash_type", "ruby.h")