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-rw-r--r--test/-ext-/string/test_modify_expand.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/-ext-/string/test_modify_expand.rb b/test/-ext-/string/test_modify_expand.rb
index d3f5a17037..c7093e3892 100644
--- a/test/-ext-/string/test_modify_expand.rb
+++ b/test/-ext-/string/test_modify_expand.rb
@@ -1,6 +1,7 @@
# frozen_string_literal: false
require 'test/unit'
require "-test-/string"
+require "rbconfig/sizeof"
class Test_StringModifyExpand < Test::Unit::TestCase
def test_modify_expand_memory_leak