diff --git a/Library/Homebrew/rubocops/resource_requires_dependencies.rb b/Library/Homebrew/rubocops/resource_requires_dependencies.rb
index f24c7f342f..b108dfa09f 100644
--- a/Library/Homebrew/rubocops/resource_requires_dependencies.rb
+++ b/Library/Homebrew/rubocops/resource_requires_dependencies.rb
@@ -35,6 +35,8 @@ module RuboCop
             when "pyyaml"
               kind = "depends_on"
               ["libyaml"]
+            else
+              []
             end
             next if required_deps.all? { |dep| uses_from_macos.include?(dep) || depends_on.include?(dep) }