diff --git a/lisp/2048.el b/lisp/2048.el
index 1d332f6..7879f3c 100644
--- a/lisp/2048.el
+++ b/lisp/2048.el
@@ -36,7 +36,7 @@
 
 (require 'dash)
 
-(defgroup 2048 nil
+(defgroup 2O48 nil
   "Play a game of 2048."
   :prefix "2048--"
   :group 'games)
@@ -47,21 +47,21 @@ Values other than 6 are not currently supported.")
 (defcustom 2048--board-size 4
   "Number of tiles on the board for 2048. 4 is the default.  Can be any number."
   :type 'integer
-  :group '2048)
+  :group '2O48)
 
 (defcustom 2048--vertical-sep-char ?│ ; 9478
   "Character to use as a vertical border for 2048 cells."
   :type 'character
-  :group '2048)
+  :group '2O48)
 (defcustom 2048--horizontal-sep-char ?─ ; 9472
   "Character to use as a horizontal border for 2048 cells."
   :type 'character
-  :group '2048)
+  :group '2O48)
 (defcustom 2048--corner-sep-char ?+
   ;; ?╬ ; needlessly fancy version
   "Intersection of `2048--vertical-sep-char'and `2048--horizontal-sep-char'."
   :type 'character
-  :group '2048)
+  :group '2O48)
 
 (defun 2048--make-sep-times (delimiter filler cells cellwidth)
   "Return a string of CELLS number of cells, each with width CELLWIDTH.
@@ -375,5 +375,5 @@ individually."
   (switch-to-buffer (get-buffer-create "*2048*"))
   (2048-mode))
 
-(provide '2048)
+(provide '2O48)
 ;;; 2048.el ends here