diff --git a/appengine/runtime_builders/template_builder.sh b/appengine/runtime_builders/template_builder.sh
index eef41786..63c44c8f 100644
--- a/appengine/runtime_builders/template_builder.sh
+++ b/appengine/runtime_builders/template_builder.sh
@@ -11,5 +11,5 @@ fi
 source "$KOKORO_GFILE_DIR/common.sh"
 
 cd github
-yes | sudo pip3 install ruamel.yaml
+yes | sudo -E pip3 install ruamel.yaml
 python3 runtimes-common/appengine/runtime_builders/template_builder.py -f "${KOKORO_GFILE_DIR}/${CONFIG_FILE}"