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-rw-r--r--spec/ruby/core/io/set_encoding_spec.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/spec/ruby/core/io/set_encoding_spec.rb b/spec/ruby/core/io/set_encoding_spec.rb
index a9d783325c..5aec6a96c3 100644
--- a/spec/ruby/core/io/set_encoding_spec.rb
+++ b/spec/ruby/core/io/set_encoding_spec.rb
@@ -87,7 +87,7 @@ describe "IO#set_encoding when passed nil, nil" do
describe "with 'rb' mode" do
it "returns Encoding.default_external" do
@io = new_io @name, "rb"
- @io.external_encoding.should equal(Encoding::ASCII_8BIT)
+ @io.external_encoding.should equal(Encoding::BINARY)
@io.set_encoding nil, nil
@io.external_encoding.should equal(Encoding.default_external)