diff --git a/Library/Homebrew/utils/pypi.rb b/Library/Homebrew/utils/pypi.rb
index 6b9189b422..1213de08e1 100644
--- a/Library/Homebrew/utils/pypi.rb
+++ b/Library/Homebrew/utils/pypi.rb
@@ -333,7 +333,7 @@ module PyPI
       EOS
     end
 
-    unless exclude_packages.empty?
+    if exclude_packages.any?
       odie "Excluded superfluous packages: #{", ".join(exclude_packages)}"
     end