diff --git a/spacemacs/config.el b/spacemacs/config.el
index 2401b975d..e3991b86c 100644
--- a/spacemacs/config.el
+++ b/spacemacs/config.el
@@ -103,9 +103,7 @@ It runs `tabulated-list-revert-hook', then calls `tabulated-list-print'."
 ;; because it avoids autoloads of elisp modes)
 (setq initial-major-mode 'text-mode)
 ;; whitespace-mode
-(add-hook 'prog-mode-hook (lambda ()
-                            (interactive)
-                            (setq show-trailing-whitespace 1)))
+(add-hook 'prog-mode-hook (lambda () (setq show-trailing-whitespace 1)))
 ;; When point is on paranthesis, highlight the matching one
 (show-paren-mode t)
 ;; use only spaces and no tabs