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-rw-r--r--spec/ruby/library/stringio/printf_spec.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/spec/ruby/library/stringio/printf_spec.rb b/spec/ruby/library/stringio/printf_spec.rb
index f88ca1eb20..9dd1a3b410 100644
--- a/spec/ruby/library/stringio/printf_spec.rb
+++ b/spec/ruby/library/stringio/printf_spec.rb
@@ -32,7 +32,7 @@ describe "StringIO#printf" do
describe "formatting" do
it_behaves_like :kernel_sprintf, -> format, *args {
- io = StringIO.new
+ io = StringIO.new(+"")
io.printf(format, *args)
io.string
}