diff --git a/.rubocop.yml b/.rubocop.yml
index e5ff963..dc8da21 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -85,7 +85,7 @@ Metrics/CyclomaticComplexity:
   Max: 17
 
 # Configuration parameters: AllowURI, URISchemes.
-Metrics/LineLength:
+Layout/LineLength:
   Max: 370
 
 # Configuration parameters: CountKeywordArgs.
@@ -145,7 +145,7 @@ Layout/HeredocIndentation:
 Style/SpecialGlobalVars:
   Enabled: false
 
-PercentLiteralDelimiters:
+Style/PercentLiteralDelimiters:
   PreferredDelimiters:
     "%":  ()
     "%i": ()
diff --git a/lib/swiftformat/plugin.rb b/lib/swiftformat/plugin.rb
index 377e7c7..3c5414d 100644
--- a/lib/swiftformat/plugin.rb
+++ b/lib/swiftformat/plugin.rb
@@ -109,13 +109,13 @@ def find_swift_files
     # @return [void]
     def send_inline_comment(results, method)
       results[:errors].each do |error|
-        file = error[:file]     
-        file_components = file.split(':')
+        file = error[:file]
+        file_components = file.split(":")
         line = file_components[1]
-        filename = file_components.first.split('/').last
+        filename = file_components.first.split("/").last
         file_path = file_components.first
 
-        message = "#{error[:rules].join(', ')}".dup
+        message = error[:rules].join(", ").to_s.dup
         message << " `#{filename}:#{line}`" # file:line for pasting into Xcode Quick Open
 
         send(method, message, file: file_path, line: line)