diff --git a/lua/toggle-checkbox.lua b/lua/toggle-checkbox.lua
index 4ae54e8..03714a7 100644
--- a/lua/toggle-checkbox.lua
+++ b/lua/toggle-checkbox.lua
@@ -1,21 +1,21 @@
 local checked_character = "x"
 
-local checked_checkbox = "[" .. checked_character .. "]"
+local checked_checkbox = "%[" .. checked_character .. "%]"
 local unchecked_checkbox = "%[ %]"
 
 local line_contains_an_unchecked_checkbox = function(line)
 	return string.find(line, unchecked_checkbox)
 end
 
-local checkbox = {}
+local checkbox = {
+	check = function(line)
+		return line:gsub(unchecked_checkbox, checked_checkbox)
+	end,
 
-checkbox.check = function(line)
-	return line:gsub("%[ %]", checked_checkbox)
-end
-
-checkbox.uncheck = function(line)
-	return line:gsub("%[" .. checked_character .. "%]", unchecked_checkbox)
-end
+	uncheck = function(line)
+		return line:gsub(checked_checkbox, unchecked_checkbox)
+	end,
+}
 
 local M = {}