1 files changed, 2 insertions, 0 deletions

diff --git a/lisp/progmodes/compile.el b/lisp/progmodes/compile.el
index 26e37341796..27d4995f3d0 100644
--- a/lisp/progmodes/compile.el
+++ b/lisp/progmodes/compile.el
@@ -756,6 +756,8 @@ exited abnormally with code %d\n"
   "Keymap for compilation log buffers.
 `compilation-minor-mode-map' is a cdr of this.")
 
+(put 'compilation-mode 'mode-class 'special)
+
 ;;;###autoload
 (defun compilation-mode ()
   "Major mode for compilation log buffers.