diff --git a/lua/my_lspinstall.lua b/lua/my_lspinstall.lua
index 6f89b62..f1658dc 100644
--- a/lua/my_lspinstall.lua
+++ b/lua/my_lspinstall.lua
@@ -22,6 +22,7 @@ local on_attach = function(client, bufnr)
   local function buf_set_option(...) vim.api.nvim_buf_set_option(bufnr, ...) end
 
   buf_set_option('omnifunc', 'v:lua.vim.lsp.omnifunc')
+  vim.api.nvim_buf_set_option(0, 'formatexpr', 'v:lua.vim.lsp.formatexpr()')
 
   -- Mappings.
   local opts = { noremap=true, silent=true }