diff --git a/ftplugin/http.lua b/ftplugin/http.lua
index 7ea45af..5beb386 100644
--- a/ftplugin/http.lua
+++ b/ftplugin/http.lua
@@ -2,6 +2,13 @@ vim.bo.commentstring = "# %s"
 vim.wo.conceallevel = 0
 vim.opt.comments:remove("n:>")
 
+-- NOTE: Manually start tree-sitter-http highlighting.
+-- Just in case user didn't enabled auto highlighting option.
+local ok = pcall(vim.treesitter.start, 0, "http")
+if not ok then
+    vim.notify("Failed to attach tree-sitter-http parser to current buffer", vim.log.levels.ERROR, { title = "rest.nvim" })
+end
+
 local dotenv = require("rest-nvim.dotenv")
 
 vim.b._rest_nvim_count = 1