diff --git a/.travis.yml b/.travis.yml
index 5fcd0e6..94c250f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,9 +9,9 @@ python:
 install:
 - pip install -r requirements.txt
 script:
-- if [[ $TRAVIS_PYTHON_VERSION == 2.7 ]]; then export CIBW_BUILD=cp27; fi
-- if [[ $TRAVIS_PYTHON_VERSION == 3.5 ]]; then export CIBW_BUILD=cp35; fi
-- if [[ $TRAVIS_PYTHON_VERSION == 3.6 ]]; then export CIBW_BUILD=cp36; fi
+- if [[ $TRAVIS_PYTHON_VERSION == 2.7 ]]; then export CIBW_BUILD='cp27*'; fi
+- if [[ $TRAVIS_PYTHON_VERSION == 3.5 ]]; then export CIBW_BUILD='cp35*'; fi
+- if [[ $TRAVIS_PYTHON_VERSION == 3.6 ]]; then export CIBW_BUILD='cp36*'; fi
 - pip install cibuildwheel==0.10.1
 - cibuildwheel --output-dir wheelhouse