diff --git a/gnu-apl-interactive.el b/gnu-apl-interactive.el
index 8d4f71a..78dad96 100644
--- a/gnu-apl-interactive.el
+++ b/gnu-apl-interactive.el
@@ -251,7 +251,9 @@ to `gnu-apl-executable')."
                                    (if (and gnu-apl-native-communication gnu-apl-use-new-native-library)
                                        (list "--emacs_arg" (int-to-string gnu-apl-native-listener-port)))
                                    (if (not gnu-apl-show-apl-welcome)
-                                       (list "--silent"))))
+                                       (list "--silent"))
+                                   (if (not (zerop (length gnu-apl-lx)))
+                                       (list "--LX" gnu-apl-lx)) ))
       (setq gnu-apl-current-session buffer)
 
       (gnu-apl-interactive-mode)
diff --git a/gnu-apl-mode.el b/gnu-apl-mode.el
index ca79141..076f0db 100644
--- a/gnu-apl-mode.el
+++ b/gnu-apl-mode.el
@@ -60,6 +60,12 @@ is nil, the apl binary is called with the --silent flag."
   :group 'gnu-apl)
 
 ;;;###autoload
+(defcustom gnu-apl-lx ""
+  "APL expression or command to execute upon starting GNU APL."
+  :type 'string
+  :group 'gnu-apl)
+
+;;;###autoload
 (defcustom gnu-apl-native-listener-port 0
   "The port number that the native listener should listen to.
 If zero, randomly choose an available port.
diff --git a/native/Makefile b/native/Makefile
index a827848..015d83e 100644