diff --git a/lib/debug/server_cdp.rb b/lib/debug/server_cdp.rb
index ebe23b464..aa3ede9f1 100644
--- a/lib/debug/server_cdp.rb
+++ b/lib/debug/server_cdp.rb
@@ -628,12 +628,6 @@ def cleanup_reader
 
     ## Called by the SESSION thread
 
-    def readline prompt
-      return 'c' unless @q_msg
-
-      @q_msg.pop || 'kill!'
-    end
-
     def respond req, **result
       send_response req, **result
     end