diff --git a/README.org b/README.org
index a3925cf9..02f98b53 100644
--- a/README.org
+++ b/README.org
@@ -4023,6 +4023,15 @@ It's probably smart to have markdown.
   :mode (("\\.md\\'" . markdown-mode)
          ("\\.rmd\\'". markdown-mode))
   :config
+
+  (dolist (face
+           '((markdown-header-face-1 1.4 ultra-bold)
+             (markdown-header-face-2 1.2 extra-bold)
+             (markdown-header-face-3 1.1 bold)
+             (markdown-header-face-4 1.0 semi-bold)
+             (markdown-header-face-5 1.0 normal)))
+    (set-face-attribute (nth 0 face) nil :weight (nth 2 face) :height (nth 1 face)))
+
   (setq markdown-fontify-code-blocks-natively t)
   (add-hook 'markdown-mode-hook 'chris/org-mode-setup)
   (custom-set-faces '(markdown-code-face ((t (:inherit org-block)))))
diff --git a/init.el b/init.el
index 5c28661a..b5bd7b83 100644
--- a/init.el
+++ b/init.el
@@ -2924,6 +2924,15 @@ targets."
   :mode (("\\.md\\'" . markdown-mode)
          ("\\.rmd\\'". markdown-mode))
   :config
+
+  (dolist (face
+           '((markdown-header-face-1 1.4 ultra-bold)
+             (markdown-header-face-2 1.2 extra-bold)
+             (markdown-header-face-3 1.1 bold)
+             (markdown-header-face-4 1.0 semi-bold)
+             (markdown-header-face-5 1.0 normal)))
+    (set-face-attribute (nth 0 face) nil :weight (nth 2 face) :height (nth 1 face)))
+
   (setq markdown-fontify-code-blocks-natively t)
   (add-hook 'markdown-mode-hook 'chris/org-mode-setup)
   (custom-set-faces '(markdown-code-face ((t (:inherit org-block)))))