diff --git a/Library/Homebrew/utils/pypi.rb b/Library/Homebrew/utils/pypi.rb
index 69332c2af2..aad702da84 100644
--- a/Library/Homebrew/utils/pypi.rb
+++ b/Library/Homebrew/utils/pypi.rb
@@ -235,6 +235,7 @@ module PyPI
       if main_package.valid_pypi_package?
         main_package.version = version
       else
+        return if ignore_non_pypi_packages
         odie "The main package is not a PyPI package. Please update its URL manually."
       end
     end