diff --git a/core/regexp/linear_time_spec.rb b/core/regexp/linear_time_spec.rb
index c3b3500549..cf9e73c37c 100644
--- a/core/regexp/linear_time_spec.rb
+++ b/core/regexp/linear_time_spec.rb
@@ -24,4 +24,10 @@
       Regexp.linear_time?(/a/, Regexp::IGNORECASE)
     }.should complain(/warning: flags ignored/)
   end
+
+  ruby_version_is "3.3" do
+    it "returns true for positive lookarounds" do
+      Regexp.linear_time?(/(?:(?=a*)a)*/).should == true
+    end
+  end
 end