diff --git a/init.el b/init.el
index 01768e4..a0d7181 100644
--- a/init.el
+++ b/init.el
@@ -115,7 +115,10 @@
   :config (show-paren-mode))
 
 (use-package prog-mode
-  :config (global-prettify-symbols-mode))
+  :config (global-prettify-symbols-mode)
+  (defun indicate-buffer-boundaries-left ()
+    (setq indicate-buffer-boundaries 'left))
+  (add-hook 'prog-mode-hook #'indicate-buffer-boundaries-left))
 
 (use-package recentf
   :demand t