1 files changed, 2 insertions, 0 deletions

diff --git a/lisp/gud.el b/lisp/gud.el
index 8227b8be97e..2bc3affb1fa 100644
--- a/lisp/gud.el
+++ b/lisp/gud.el
@@ -1069,6 +1069,8 @@ and source-file directory for your debugger."
 (defvar gud-delete-prompt-marker nil)
 
 
+(put 'gud-mode 'mode-class 'special)
+
 (defun gud-mode ()
   "Major mode for interacting with an inferior debugger process.