diff --git a/Library/Homebrew/cleanup.rb b/Library/Homebrew/cleanup.rb
index c2c03614ba..cc79326f80 100644
--- a/Library/Homebrew/cleanup.rb
+++ b/Library/Homebrew/cleanup.rb
@@ -321,7 +321,7 @@ module Homebrew
         yield
       end
 
-      @disk_cleanup_size += disk_usage
+      @disk_cleanup_size += disk_usage - path.disk_usage
     end
 
     def cleanup_lockfiles(*lockfiles)