diff --git a/solarized-theme.el b/solarized-theme.el
index ce77f65..d0cde29 100644
--- a/solarized-theme.el
+++ b/solarized-theme.el
@@ -17,30 +17,6 @@
                      (nth 1 (assoc color-name solarized-colors)))
                    '(base02 red green yellow blue magenta cyan base2)))))
 
-(cl-defun solarized-update-background-mode
-    (appearance &optional (frames (frame-list)))
-  "Set the APPEARANCE of all frames to either 'light or 'dark.
-This is not specific to Solarized – it will update the appearance of any theme
-that observes the background characteristic."
-  (setq frame-background-mode appearance)
-  (mapc #'frame-set-background-mode frames)
-  ;; Supposedly #'frame-set-background-mode updates the faces, but it doesn’t
-  ;; seem to actually., so re-enable all the themes.
-  (mapc #'enable-theme (reverse custom-enabled-themes))
-  ;; For some reason, ‘enable-theme’ (or maybe ‘solarized’?) is resetting the
-  ;; ‘frame-background-mode’, so reset it here.
-  (setq frame-background-mode appearance))
-
-(defun solarized-toggle-background-mode ()
-  "Toggle between light and dark background modes.
-This is not specific to Solarized – it will update the appearance of any theme
-that observes the background characteristic."
-  (interactive)
-  (let ((new-mode (pcase frame-background-mode
-                    ('dark 'light)
-                    (_ 'dark))))
-    (solarized-update-background-mode new-mode)))
-
 ;;;###autoload
 (when load-file-name
   (add-to-list 'custom-theme-load-path