diff --git a/micromamba.el b/micromamba.el
index f8730a6..b133f91 100644
--- a/micromamba.el
+++ b/micromamba.el
@@ -386,7 +386,7 @@ buffer."
   ;; Forms
   (if micromamba-env-autoactivate-mode ;; already on, now switching off
     (add-to-list 'window-selection-change-functions #'micromamba--switch-buffer-auto-activate)
-    (delete #'micromamba--switch-buffer-auto-activate 'window-selection-change-functions)))
+    (delete #'micromamba--switch-buffer-auto-activate window-selection-change-functions)))
 
 (provide 'micromamba)
 ;;; micromamba.el ends here