diff --git a/lib/debug/console.rb b/lib/debug/console.rb
index 533e4c8de..8e4dfaa7c 100644
--- a/lib/debug/console.rb
+++ b/lib/debug/console.rb
@@ -52,7 +52,7 @@ def readline_setup prompt
             end
             files
           else
-            commands.keys.grep(/\A#{given}/)
+            commands.keys.grep(/\A#{Regexp.escape(given)}/)
           end
         end