diff --git a/slack-pixiv/commands/pixiv.rb b/slack-pixiv/commands/pixiv.rb
index 3fd198f..08fad2d 100644
--- a/slack-pixiv/commands/pixiv.rb
+++ b/slack-pixiv/commands/pixiv.rb
@@ -13,7 +13,7 @@ module SlackMathbot
 
         # Create iOS Illustration URL
         splitter = "pixiv://illusts/" + pixiv_url.split("illust_id=")[-1]
-	puts splitter
+	puts splitter.to_s
 	ios_url = splitter.slice(/(^[0-9]+$)/)
        	puts ios_url