diff --git a/Library/.rubocop.yml b/Library/.rubocop.yml
index 89dcaa463d..d6d0e5d502 100644
--- a/Library/.rubocop.yml
+++ b/Library/.rubocop.yml
@@ -1,3 +1,8 @@
+AllCops:
+  Exclude:
+    - 'Homebrew/vendor/**/*'
+    - 'Homebrew/test/vendor/**/*'
+
 # 1.8-style hash keys
 Style/HashSyntax:
     EnforcedStyle: hash_rockets
diff --git a/Library/Homebrew/cmd/style.rb b/Library/Homebrew/cmd/style.rb
index b39a2d8878..3f28207ea3 100644
--- a/Library/Homebrew/cmd/style.rb
+++ b/Library/Homebrew/cmd/style.rb
@@ -9,7 +9,7 @@ module Homebrew
     Homebrew.install_gem_setup_path! "rubocop", "0.32.1"
 
     args = [
-      "--format", "simple", "--config",
+      "--format", "simple", "--force-exclusion", "--config",
       "#{HOMEBREW_LIBRARY}/.rubocop.yml"
     ]