diff --git a/actionview/lib/action_view/helpers/tag_helper.rb b/actionview/lib/action_view/helpers/tag_helper.rb

index f09595d..ac60cfd 100644

--- a/actionview/lib/action_view/helpers/tag_helper.rb

+++ b/actionview/lib/action_view/helpers/tag_helper.rb

@@ -179,7 +179,7 @@ def tag_option(key, value, escape)

           if value.is_a?(Array)

             value = escape ? safe_join(value, " ") : value.join(" ")

           else

-            value = escape ? ERB::Util.unwrapped_html_escape(value) : value

+            value = escape ? ERB::Util.unwrapped_html_escape(value) : value.to_s

           end

           %(#{key}="#{value.gsub(/"/, '"'.freeze)}")

         end