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-rw-r--r--test/stringio/test_stringio.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/stringio/test_stringio.rb b/test/stringio/test_stringio.rb
index c83e8c9ec4..a3f6dfc3e8 100644
--- a/test/stringio/test_stringio.rb
+++ b/test/stringio/test_stringio.rb
@@ -1,6 +1,7 @@
# frozen_string_literal: false
require 'test/unit'
require 'stringio'
+require "rbconfig/sizeof"
require_relative '../ruby/ut_eof'
class TestStringIO < Test::Unit::TestCase