diff --git a/test/irb/test_context.rb b/test/irb/test_context.rb
index dae0f8f6e4..f59a23a99d 100644
--- a/test/irb/test_context.rb
+++ b/test/irb/test_context.rb
@@ -93,7 +93,7 @@ module TestIRB
     def test_prompt_n_deprecation
       irb = IRB::Irb.new(IRB::WorkSpace.new(Object.new))
 
-      out, err = capture_output do
+      _, err = capture_output do
         irb.context.prompt_n = "foo"
         irb.context.prompt_n
       end
diff --git a/test/irb/test_irb.rb b/test/irb/test_irb.rb
index c685912093..08fe41f5e7 100644
--- a/test/irb/test_irb.rb
+++ b/test/irb/test_irb.rb
@@ -94,8 +94,8 @@ module TestIRB
     end
 
     def setup
-      @irb = build_irb
       save_encodings
+      @irb = build_irb
     end
 
     def teardown