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-rw-r--r--spec/ruby/core/string/unpack/u_spec.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/spec/ruby/core/string/unpack/u_spec.rb b/spec/ruby/core/string/unpack/u_spec.rb
index 7845e6d5f2..456abee784 100644
--- a/spec/ruby/core/string/unpack/u_spec.rb
+++ b/spec/ruby/core/string/unpack/u_spec.rb
@@ -33,7 +33,7 @@ describe "String#unpack with format 'u'" do
str = "".unpack("u")[0]
str.encoding.should == Encoding::BINARY
- str = "1".force_encoding('UTF-8').unpack("u")[0]
+ str = "1".dup.force_encoding('UTF-8').unpack("u")[0]
str.encoding.should == Encoding::BINARY
end