diff --git a/Library/Homebrew/utils/pypi.rb b/Library/Homebrew/utils/pypi.rb
index d1cffdfd36a2ebd5539ab959647880c32813cc1d..30e5dbbe5431a1818b2f9d0de94ac72c22043cac 100644
--- a/Library/Homebrew/utils/pypi.rb
+++ b/Library/Homebrew/utils/pypi.rb
@@ -231,7 +231,7 @@ module PyPI
     end
 
     # Remove extra packages that may be included in pipgrip output
-    exclude_list = %W[#{main_package.name} argparse pip setuptools wheel wsgiref].map { |p| Package.new p }
+    exclude_list = %W[#{main_package.name.downcase} argparse pip setuptools wheel wsgiref].map { |p| Package.new p }
     found_packages.delete_if { |package| exclude_list.include? package }
 
     new_resource_blocks = ""