diff --git a/layers/+chat/slack/config.el b/layers/+chat/slack/config.el
index 4f0c272ed..1b90a8f67 100644
--- a/layers/+chat/slack/config.el
+++ b/layers/+chat/slack/config.el
@@ -1,6 +1,6 @@
 ;;; config.el --- slack layer configuration file for Spacemacs
 ;;
-;; Copyright (c) 2012-2018 Sylvain Benner & Contributors
+;; Copyright (c) 2012-2020 Sylvain Benner & Contributors
 ;;
 ;; Author: Benjamin Reynolds <breyno127@gmail.com>
 ;; URL: https://github.com/syl20bnr/spacemacs
diff --git a/layers/+chat/slack/funcs.el b/layers/+chat/slack/funcs.el
index ab1c00bcd..5e7427f8e 100644
--- a/layers/+chat/slack/funcs.el
+++ b/layers/+chat/slack/funcs.el
@@ -1,6 +1,6 @@
 ;;; funcs.el --- slack layer functions file for Spacemacs
 ;;
-;; Copyright (c) 2012-2018 Sylvain Benner & Contributors
+;; Copyright (c) 2012-2020 Sylvain Benner & Contributors
 ;;
 ;; Author: Sylvain Benner <sylvain.benner@gmail.com>
 ;; URL: https://github.com/syl20bnr/spacemacs
diff --git a/layers/+chat/slack/layers.el b/layers/+chat/slack/layers.el
index c2e479a93..87ec7a507 100644
--- a/layers/+chat/slack/layers.el
+++ b/layers/+chat/slack/layers.el
@@ -1,6 +1,6 @@
 ;;; layers.el --- Slack layer layers File for Spacemacs
 ;;
-;; Copyright (c) 2012-2018 Sylvain Benner & Contributors
+;; Copyright (c) 2012-2020 Sylvain Benner & Contributors
 ;;
 ;; Author: Sylvain Benner <sylvain.benner@gmail.com>
 ;; URL: https://github.com/syl20bnr/spacemacs
diff --git a/layers/+chat/slack/packages.el b/layers/+chat/slack/packages.el
index 6fcbed81b..42fe1b780 100644
--- a/layers/+chat/slack/packages.el
+++ b/layers/+chat/slack/packages.el
@@ -1,6 +1,6 @@
 ;;; packages.el --- slack layer packages file for Spacemacs.
 ;;
-;; Copyright (c) 2012-2018 Sylvain Benner & Contributors
+;; Copyright (c) 2012-2020 Sylvain Benner & Contributors
 ;;
 ;; Author: Kosta Harlan <kosta@kostaharlan.net>
 ;; URL: https://github.com/syl20bnr/spacemacs
@@ -9,10 +9,6 @@
 ;;
 ;;; License: GPLv3
 
-;;; Commentary:
-
-;;; Code:
-
 ;; TODO: Integrate company-emoji.
 
 (defconst slack-packages
@@ -23,8 +19,7 @@
     linum
     persp-mode
     slack
-    window-purpose
-    ))
+    window-purpose))
 
 (defun slack/init-alert ()
   (use-package alert
@@ -92,7 +87,7 @@
       (kbd "@") 'slack-message-embed-mention
       (kbd "#") 'slack-message-embed-channel)))
 
-(defun slack/pre-init-window-purpose ()
-  (spacemacs|use-package-add-hook window-purpose
-    :pre-config
-    (add-to-list 'purpose-user-mode-purposes '(slack-mode . chat))))
+(defun slack/post-init-window-purpose ()
+  (purpose-set-extension-configuration
+   :slack-layer
+   (purpose-conf :mode-purposes '((slack-mode . chat)))))