diff --git a/.travis.yml b/.travis.yml
index 29a2211..dffd9a0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -75,11 +75,12 @@ before_script:
   - ./vendor/bin/drush en composer_deploy --yes
   # Generate a multilingual Solr configuration.
   # Therefore we have to install the test modules before the tests.
-  - cp -R core/modules/system/tests/modules/entity_test core/modules/system/entity_test
-  - cp -R modules/contrib/search_api/tests/search_api_test_example_content modules/contrib/search_api/search_api_test_example_content
-  - cp -R modules/contrib/search_api_solr/tests/modules/search_api_solr_multilingual_test modules/contrib/search_api_solr/search_api_solr_multilingual_test
+  - cp -a core/modules/system/tests/modules/entity_test core/modules/system/entity_test
+  - cp -a modules/contrib/search_api/tests/search_api_test_example_content modules/contrib/search_api/search_api_test_example_content
+  - cp -a modules/contrib/search_api_solr/tests/modules/search_api_solr_multilingual_test modules/contrib/search_api_solr/search_api_solr_multilingual_test
   - ./vendor/bin/drush en --yes search_api_solr_multilingual_test
   - ./vendor/bin/drush solr-gsc solr_multilingual_search_server conf.zip $SOLR_VERSION
+  - rm -rf core/modules/system/entity_test modules/contrib/search_api/search_api_test_example_content modules/contrib/search_api_solr/search_api_solr_multilingual_test
   - unzip -o conf.zip -d $SOLR_CONFS
   - ls -lh $SOLR_CONFS
   # Install Solr