1 files changed, 2 insertions, 2 deletions
diff --git a/spec/ruby/core/string/inspect_spec.rb b/spec/ruby/core/string/inspect_spec.rb
index 8bf3d3161f..8b91ce2f84 100644
--- a/spec/ruby/core/string/inspect_spec.rb
+++ b/spec/ruby/core/string/inspect_spec.rb
@@ -4,7 +4,7 @@ require_relative 'fixtures/classes'
 
 describe "String#inspect" do
   it "does not return a subclass instance" do
-    StringSpecs::MyString.new.inspect.should be_an_instance_of(String)
+    StringSpecs::MyString.new.inspect.should.instance_of?(String)
   end
 
   it "returns a string with special characters replaced with \\<char> notation" do
@@ -327,7 +327,7 @@ describe "String#inspect" do
   end
 
   it "works for broken US-ASCII strings" do
-    s = "©".force_encoding("US-ASCII")
+    s = "©".dup.force_encoding("US-ASCII")
     s.inspect.should == '"\xC2\xA9"'
   end