diff --git a/init.el b/init.el
index 21a1a7e..4d41553 100644
--- a/init.el
+++ b/init.el
@@ -2180,7 +2180,8 @@ line in the block and manually deal with indentation."
         (not (sly-connected-p))))
   (defun my/-format-only-when-sly-running ()
     "Make apheleia-mode format lisp buffers only when sly is running."
-    (add-to-list 'apheleia-skip-functions #'my/-apheleia-sly-skip-function)))
+    (add-to-list (make-local-variable 'apheleia-skip-functions)
+                 #'my/-apheleia-sly-skip-function)))
 ;; sly
 (use-package sly
   ;; :hook (lisp-mode . my/-lisp-mode-autoconnect-sly)