diff --git a/window-numbering.el b/window-numbering.el
index 00650d1..3dfb841 100644
--- a/window-numbering.el
+++ b/window-numbering.el
@@ -85,7 +85,8 @@ return a number to have it assigned to the current-window, nil otherwise."
 (defconst window-numbering-mode-line-position 1
   "The position in the mode-line `window-numbering-mode' displays the number.")
 
-(defface window-numbering-face '()
+(defface window-numbering-face
+  '()
   "Face used for the number in the mode-line."
   :group 'window-numbering)