diff --git a/interface.lisp b/interface.lisp
index 573a835160eaf14cecd4e414ac206e0eccddabdd..f1a086b9120af029337255df1406b8be75be6fc2 100644
--- a/interface.lisp
+++ b/interface.lisp
@@ -105,7 +105,7 @@
    #:*compile-file-warnings-behaviour*
    #:*compile-file-failure-behaviour*
    #:*resolve-symlinks*
-   #:*load-system-operation* #:*immutable-systems*
+   #:*load-system-operation*
    #:*asdf-verbose* ;; unused. For backward-compatibility only.
    #:*verbose-out*