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-rw-r--r--test/-ext-/string/test_capacity.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/-ext-/string/test_capacity.rb b/test/-ext-/string/test_capacity.rb
index b4e4fb7c02..54f3caf32e 100644
--- a/test/-ext-/string/test_capacity.rb
+++ b/test/-ext-/string/test_capacity.rb
@@ -1,6 +1,7 @@
# frozen_string_literal: true
require 'test/unit'
require '-test-/string'
+require 'rbconfig/sizeof'
class Test_StringCapacity < Test::Unit::TestCase
def test_capacity_embeded