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-rw-r--r--spec/ruby/core/string/dup_spec.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/spec/ruby/core/string/dup_spec.rb b/spec/ruby/core/string/dup_spec.rb
index 73f71b8ffc..073802d84b 100644
--- a/spec/ruby/core/string/dup_spec.rb
+++ b/spec/ruby/core/string/dup_spec.rb
@@ -51,7 +51,7 @@ describe "String#dup" do
end
it "does not modify the original setbyte-mutated string when changing dupped string" do
- orig = "a"
+ orig = +"a"
orig.setbyte 0, "b".ord
copy = orig.dup
orig.setbyte 0, "c".ord