diff --git a/Library/Homebrew/exceptions.rb b/Library/Homebrew/exceptions.rb
index 28b46198e2..0a4f74e4ca 100644
--- a/Library/Homebrew/exceptions.rb
+++ b/Library/Homebrew/exceptions.rb
@@ -1,8 +1,8 @@
-class UsageError <RuntimeError; end
-class FormulaUnspecifiedError <UsageError; end
-class KegUnspecifiedError <UsageError; end
+class UsageError < RuntimeError; end
+class FormulaUnspecifiedError < UsageError; end
+class KegUnspecifiedError < UsageError; end
 
-class MultipleVersionsInstalledError <RuntimeError
+class MultipleVersionsInstalledError < RuntimeError
   attr :name
 
   def initialize name
@@ -13,7 +13,7 @@ end
 
 class NotAKegError < RuntimeError; end
 
-class NoSuchKegError <RuntimeError
+class NoSuchKegError < RuntimeError
   attr :name
 
   def initialize name