diff --git a/plugin/todoer.lua b/plugin/todoer.lua
index 17034b2..3249e02 100644
--- a/plugin/todoer.lua
+++ b/plugin/todoer.lua
@@ -58,7 +58,7 @@ local function add_todo()
 
 	local line = vim.api.nvim_get_current_line()
 
-	if !string.match(line, openpattern) and !string.match(line, closedpattern) then
+	if string.match(line, openpattern) == false and string.match(line, closedpattern) == false then
 		line = "- [ ] " .. line
 		vim.api.nvim_set_current_line(line)
 		vim.api.nvim_feedkeys("A", "n", true)