diff --git a/ci/prep_cython_cache.sh b/ci/prep_cython_cache.sh
index 6f16dce2fb431..cadc356b641f9 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"`
-pyx_cache_file_list=`find ${PYX_CACHE_DIR} -name "*.pyx"`
+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"`
 
 CACHE_File="$HOME/.cache/cython_files.tar"
 
diff --git a/ci/submit_cython_cache.sh b/ci/submit_cython_cache.sh
index 4f60df0ccb2d8..5c98c3df61736 100755
--- a/ci/submit_cython_cache.sh
+++ b/ci/submit_cython_cache.sh
@@ -2,7 +2,7 @@
 
 CACHE_File="$HOME/.cache/cython_files.tar"
 PYX_CACHE_DIR="$HOME/.cache/pyxfiles"
-pyx_file_list=`find ${TRAVIS_BUILD_DIR} -name "*.pyx"`
+pyx_file_list=`find ${TRAVIS_BUILD_DIR} -name "*.pyx" -o -name "*.pxd"`
 
 rm -rf $CACHE_File
 rm -rf $PYX_CACHE_DIR