diff --git a/lua/lspconfig/server_configurations/marksman.lua b/lua/lspconfig/server_configurations/marksman.lua
index 113cb1e39f..2dd01a28e9 100644
--- a/lua/lspconfig/server_configurations/marksman.lua
+++ b/lua/lspconfig/server_configurations/marksman.lua
@@ -6,7 +6,7 @@ local cmd = { bin_name, 'server' }
 return {
   default_config = {
     cmd = cmd,
-    filetypes = { 'markdown' },
+    filetypes = { 'markdown', 'markdown.mdx' },
     root_dir = function(fname)
       local root_files = { '.marksman.toml' }
       return util.root_pattern(unpack(root_files))(fname) or util.find_git_ancestor(fname)