diff --git a/Library/Homebrew/cmd/style.rb b/Library/Homebrew/cmd/style.rb
index c598e9062e..db61116be7 100644
--- a/Library/Homebrew/cmd/style.rb
+++ b/Library/Homebrew/cmd/style.rb
@@ -54,20 +54,22 @@ module Homebrew
     args << "--auto-correct" if fix
     args += files
 
-    case output_type
-    when :print
-      args << "--display-cop-names" if ARGV.include? "--display-cop-names"
-      system "rubocop", "--format", "simple", *args
-      !$?.success?
-    when :json
-      json = Utils.popen_read_text("rubocop", "--format", "json", *args)
-      # exit status of 1 just means violations were found; other numbers mean execution errors
-      # exitstatus can also be nil if RuboCop process crashes, e.g. due to
-      # native extension problems
-      raise "Error while running RuboCop" if $?.exitstatus.nil? || $?.exitstatus > 1
-      RubocopResults.new(Utils::JSON.load(json))
-    else
-      raise "Invalid output_type for check_style_impl: #{output_type}"
+    HOMEBREW_LIBRARY.cd do
+      case output_type
+      when :print
+        args << "--display-cop-names" if ARGV.include? "--display-cop-names"
+        system "rubocop", "--format", "simple", *args
+        !$?.success?
+      when :json
+        json = Utils.popen_read_text("rubocop", "--format", "json", *args)
+        # exit status of 1 just means violations were found; other numbers mean execution errors
+        # exitstatus can also be nil if RuboCop process crashes, e.g. due to
+        # native extension problems
+        raise "Error while running RuboCop" if $?.exitstatus.nil? || $?.exitstatus > 1
+        RubocopResults.new(Utils::JSON.load(json))
+      else
+        raise "Invalid output_type for check_style_impl: #{output_type}"
+      end
     end
   end