diff --git a/.travis.yml b/.travis.yml
index 797e5a3e..b1354d13 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -73,6 +73,7 @@ install:
 
   - BOOST_VERSION=1.65.0 # match version number of cache directory above
   - BOOST_DIR=${TRAVIS_BUILD_DIR}/deps/boost-${BOOST_VERSION}
+  - rm -rf ${BOOST_DIR}
   - |
     if [ ! -e ${BOOST_DIR} ]; then
       mkdir -p ${BOOST_DIR}