diff --git a/ci/prep_cython_cache.sh b/ci/prep_cython_cache.sh
index cadc356b641f9..e091bb00ccedc 100755
--- a/ci/prep_cython_cache.sh
+++ b/ci/prep_cython_cache.sh
@@ -3,8 +3,8 @@
 ls "$HOME/.cache/"
 
 PYX_CACHE_DIR="$HOME/.cache/pyxfiles"
-pyx_file_list=`find ${TRAVIS_BUILD_DIR} -name "*.pyx" -o -name "*.pxd"`
-pyx_cache_file_list=`find ${PYX_CACHE_DIR} -name "*.pyx" -o -name "*.pxd"`
+pyx_file_list=`find ${TRAVIS_BUILD_DIR} -name "*.pyx" -o -name "*.pxd" -o -name "*.pxi.in"`
+pyx_cache_file_list=`find ${PYX_CACHE_DIR} -name "*.pyx" -o -name "*.pxd" -o -name "*.pxi.in"`
 
 CACHE_File="$HOME/.cache/cython_files.tar"