diff --git a/nvim/init.lua b/nvim/init.lua
index 542586b..f926929 100644
--- a/nvim/init.lua
+++ b/nvim/init.lua
@@ -88,6 +88,12 @@ vim.api.nvim_create_autocmd({ "BufRead", "BufNewFile" }, {
   command = "set filetype=rcsh",
 })
 
+-- Treat Plan 9 mkfiles as mk for tree-sitter-mk.
+vim.api.nvim_create_autocmd({ "BufRead", "BufNewFile" }, {
+  pattern = { "mkfile", "*.mk" },
+  command = "set filetype=mk",
+})
+
 -- KEYMAPS
 local keymap = vim.keymap.set
 local noremap = { noremap = true }
diff --git a/nvim/lua/plugins.lua b/nvim/lua/plugins.lua
index aff4a93..9543489 100644
--- a/nvim/lua/plugins.lua
+++ b/nvim/lua/plugins.lua
@@ -307,6 +307,11 @@ require("lazy").setup({
 			build = "make",
 			lazy = false,
 		},
+		{
+			"chiefnoah/tree-sitter-mk",
+			build = "make",
+			lazy = false,
+		},
 		-- LF
 		{
 			"ptzz/lf.vim",