diff --git a/lua/nvim-compe/lua.lua b/lua/nvim-compe/lua.lua
index 84b40d5..df6b263 100644
--- a/lua/nvim-compe/lua.lua
+++ b/lua/nvim-compe/lua.lua
@@ -34,6 +34,16 @@ local t = function(str)
     return vim.api.nvim_replace_termcodes(str, true, true, true)
 end
 
+local check_back_space = function()
+    local col = vim.fn.col('.') - 1
+    if col == 0 or vim.fn.getline('.'):sub(col, col):match('%s') then
+        return true
+    else
+        return false
+    end
+end
+
+
 _G.tab_complete = function()
   if vim.fn.pumvisible() == 1 then
     return t "<C-n>"