diff --git a/core/regexp/linear_time_spec.rb b/core/regexp/linear_time_spec.rb
index 4dc436264..5d5e87fdf 100644
--- a/core/regexp/linear_time_spec.rb
+++ b/core/regexp/linear_time_spec.rb
@@ -21,5 +21,11 @@
         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
 end