diff --git a/etc/conf.org b/etc/conf.org
index f8cb432..179f89e 100644
--- a/etc/conf.org
+++ b/etc/conf.org
@@ -1378,8 +1378,8 @@ R-markdown is enabled via polymode, which allows multiple modes in one buffer (t
 (use-package poly-R
   :straight t
   :mode
-  (("\\.Rmd\\'" . poly-markdown+r-mode)
-   ("\\.rmd\\'" . poly-markdown+r-mode)))
+  (("\\.[rR]md\\'" . poly-markdown+r-mode)
+   ("\\.[rR]md\\'" . poly-gfm+r-mode)))
 #+END_SRC
 *** YAML
 #+BEGIN_SRC emacs-lisp