diff --git a/Library/Homebrew/rubocops/components_order.rb b/Library/Homebrew/rubocops/components_order.rb
index c84766adc4..96204a58e0 100644
--- a/Library/Homebrew/rubocops/components_order.rb
+++ b/Library/Homebrew/rubocops/components_order.rb
@@ -76,8 +76,8 @@ module RuboCop
               [:url, :version, :sha256],
               [:url, :mirror, :version, :sha256],
             ]
-            minimum_methods = allowed_methods.first.map { |m| "`#{m}`" }.to_sentence
-            maximum_methods = allowed_methods.last.map { |m| "`#{m}`" }.to_sentence
+            minimum_methods = Utils.to_sentence(allowed_methods.first.map { |m| "`#{m}`" })
+            maximum_methods = Utils.to_sentence(allowed_methods.last.map { |m| "`#{m}`" })
 
             on_system_bodies.each do |on_system_block, on_system_body|
               method_name = on_system_block.method_name
diff --git a/Library/Homebrew/utils/array.rb b/Library/Homebrew/utils/array.rb
index 7fad9154a9..4b95bcf484 100644
--- a/Library/Homebrew/utils/array.rb
+++ b/Library/Homebrew/utils/array.rb
@@ -47,7 +47,7 @@ module Utils
     when 2
       +"#{array[0]}#{two_words_connector}#{array[1]}"
     else
-      +"#{array[0...-1].join(words_connector)}#{last_word_connector}#{array[-1]}"
+      +"#{T.must(array[0...-1]).join(words_connector)}#{last_word_connector}#{array[-1]}"
     end
   end
 end