1 files changed, 12 insertions, 3 deletions
diff --git a/spec/ruby/core/string/delete_prefix_spec.rb b/spec/ruby/core/string/delete_prefix_spec.rb
index bd5b56a312..8469791f74 100644
--- a/spec/ruby/core/string/delete_prefix_spec.rb
+++ b/spec/ruby/core/string/delete_prefix_spec.rb
@@ -41,9 +41,18 @@ describe "String#delete_prefix" do
     'hello'.delete_prefix(o).should == 'o'
   end
 
-  it "returns a subclass instance when called on a subclass instance" do
-    s = StringSpecs::MyString.new('hello')
-    s.delete_prefix('hell').should be_an_instance_of(StringSpecs::MyString)
+  ruby_version_is ''...'3.0' do
+    it "returns a subclass instance when called on a subclass instance" do
+      s = StringSpecs::MyString.new('hello')
+      s.delete_prefix('hell').should be_an_instance_of(StringSpecs::MyString)
+    end
+  end
+
+  ruby_version_is '3.0' do
+    it "returns a String instance when called on a subclass instance" do
+      s = StringSpecs::MyString.new('hello')
+      s.delete_prefix('hell').should be_an_instance_of(String)
+    end
   end
 end