diff --git a/lua/astrocommunity/markdown-and-latex/markmap-nvim/markmap.lua b/lua/astrocommunity/markdown-and-latex/markmap-nvim/markmap.lua
index 35bea0013..85466f3e8 100644
--- a/lua/astrocommunity/markdown-and-latex/markmap-nvim/markmap.lua
+++ b/lua/astrocommunity/markdown-and-latex/markmap-nvim/markmap.lua
@@ -1,3 +1,5 @@
+local utils = require "astronvim.utils"
+
 --  [markdown markmap]
 --  https://github.com/Zeioth/markmap.nvim
 return {
@@ -6,4 +8,9 @@ return {
   opts = {
     hide_toolbar = "false",
   },
+  {
+    "jay-babu/mason-null-ls.nvim",
+    optional = true,
+    opts = function(_, opts) opts.ensure_installed = utils.list_insert_unique(opts.ensure_installed, { "markmap" }) end,
+  },
 }