diff --git a/lisp/files.el b/lisp/files.el
index 9c8914bfc50..fd9088206d7 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -3754,7 +3754,8 @@ function is allowed to change the contents of this alist.
 This hook is called only if there is at least one file-local
 variable to set.")
 
-(defvar permanently-enabled-local-variables '(lexical-binding)
+(defvar permanently-enabled-local-variables
+  '(lexical-binding read-symbol-shorthands)
   "A list of file-local variables that are always enabled.
 This overrides any `enable-local-variables' setting.")