diff --git a/spec/env/Dockerfile.alpine b/spec/env/Dockerfile.alpine
index 6c12833d..3f7f9b84 100644
--- a/spec/env/Dockerfile.alpine
+++ b/spec/env/Dockerfile.alpine
@@ -24,4 +24,4 @@ CMD ruby -v && \
   bundle config set --local without 'development' && \
   bundle install && \
   sudo -u postgres ruby -rpg -e "p RUBY_DESCRIPTION, PG::VERSION, PG::POSTGRESQL_LIB_PATH, PG::IS_BINARY_GEM, PG::BUNDLED_LIBPQ_WITH_UNIXSOCKET; puts PG.connect.exec('SELECT version()').values" && \
-  sudo -u postgres ruby -rpg -S rspec spec/pg/**/*_spec.rb
+  sudo -u postgres ruby -rpg -S rspec spec/**/*_spec.rb -cfdoc