diff --git a/.travis.yml b/.travis.yml
index e5f40fb..6a78adf 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -81,8 +81,9 @@ jobs:
     install: skip
     script:
     - ./tests/check_tag.py
-    - pip install -U cibuildwheel
+    - pip install -U cibuildwheel wheel
     - cibuildwheel --output-dir dist
+    - SKIP_CYTHON=1 python setup.py sdist bdist_wheel
     - ls -lha dist
     env:
     - 'PIP=pip'
diff --git a/Makefile b/Makefile
index 7fbe9f2..edc0f9a 100644
--- a/Makefile
+++ b/Makefile
@@ -84,6 +84,7 @@ clean:
 	rm -f .coverage
 	rm -f .coverage.*
 	rm -rf build
+	rm -rf dist
 	rm -f pydantic/*.c pydantic/*.so
 	python setup.py clean
 	make -C docs clean