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-rw-r--r--spec/ruby/core/kernel/printf_spec.rb4
1 files changed, 2 insertions, 2 deletions
diff --git a/spec/ruby/core/kernel/printf_spec.rb b/spec/ruby/core/kernel/printf_spec.rb
index d1743dbcde..d8f93ce429 100644
--- a/spec/ruby/core/kernel/printf_spec.rb
+++ b/spec/ruby/core/kernel/printf_spec.rb
@@ -41,7 +41,7 @@ describe "Kernel.printf" do
context "io is specified" do
it_behaves_like :kernel_sprintf, -> format, *args {
- io = StringIO.new
+ io = StringIO.new(+"")
Kernel.printf(io, format, *args)
io.string
}
@@ -51,7 +51,7 @@ describe "Kernel.printf" do
it_behaves_like :kernel_sprintf, -> format, *args {
stdout = $stdout
begin
- $stdout = io = StringIO.new
+ $stdout = io = StringIO.new(+"")
Kernel.printf(format, *args)
io.string
ensure