diff --git a/layers/+emacs/helpful/packages.el b/layers/+emacs/helpful/packages.el
index 8a0e21c05..3b0fa90ea 100644
--- a/layers/+emacs/helpful/packages.el
+++ b/layers/+emacs/helpful/packages.el
@@ -51,7 +51,7 @@
     (defalias 'describe-function 'helpful-callable)
     (defalias 'describe-variable 'helpful-variable)
     (defalias 'describe-key 'helpful-key)
-    (add-hook 'helpful-mode (lambda () (setq-local tab-width 8)))
+    (add-hook 'helpful-mode-hook (lambda () (setq-local tab-width 8)))
     (when (featurep 'counsel)
       (setq counsel-describe-function-function #'helpful-callable)
       (setq counsel-describe-variable-function #'helpful-variable))))
diff --git a/layers/+spacemacs/spacemacs-defaults/packages.el b/layers/+spacemacs/spacemacs-defaults/packages.el
index a57f3f846..b5238f1fb 100644
--- a/layers/+spacemacs/spacemacs-defaults/packages.el
+++ b/layers/+spacemacs/spacemacs-defaults/packages.el
@@ -233,7 +233,7 @@
   (use-package help-fns+
     :commands (describe-keymap)
     :init (spacemacs/set-leader-keys "hdK" 'describe-keymap)
-    :config (add-hook 'help-mode (lambda () (setq-local tab-width 8)))))
+    :config (add-hook 'help-mode-hook (lambda () (setq-local tab-width 8)))))
 
 (defun spacemacs-defaults/init-hi-lock ()
   (with-eval-after-load 'hi-lock