diff --git a/lib/form_props/inputs/check_box.rb b/lib/form_props/inputs/check_box.rb
index 3678f67..e03783d 100644
--- a/lib/form_props/inputs/check_box.rb
+++ b/lib/form_props/inputs/check_box.rb
@@ -5,7 +5,7 @@ module Inputs
     class CheckBox < Base
       def initialize(object_name, method_name, template_object, checked_value, unchecked_value, options)
         @checked_value = checked_value
-        @unchecked_value = unchecked_value
+        @unchecked_value = unchecked_value.to_s
         super(object_name, method_name, template_object, options)
       end