diff --git a/Casks/r/routeconverter.rb b/Casks/r/routeconverter.rb
index 0b69aa812c..9d150e7ff8 100644
--- a/Casks/r/routeconverter.rb
+++ b/Casks/r/routeconverter.rb
@@ -10,7 +10,7 @@ cask "routeconverter" do
   livecheck do
     url :url
     strategy :extract_plist do |versions|
-      versions.values.map(&:short_version).compact.first
+      versions.values.filter_map(&:short_version).first
     end
   end