diff --git a/lib/mastodon/version.rb b/lib/mastodon/version.rb
index efd133f29..ca129da80 100644
--- a/lib/mastodon/version.rb
+++ b/lib/mastodon/version.rb
@@ -17,7 +17,7 @@ module Mastodon
     end
 
     def pre
-      ''
+      nil
     end
 
     def flags