diff --git a/upload_package b/upload_package
index 9f57dbe..5a779ff 100755
--- a/upload_package
+++ b/upload_package
@@ -54,7 +54,7 @@ PAYLOAD_SIZE=$(stat --format='%s' "${UPDATE_PATH}")
 PAYLOAD_SHA1=$(cat "${UPDATE_PATH}" | openssl dgst -sha1 -binary | base64)
 PAYLOAD_SHA256=$(cat "${UPDATE_PATH}" | openssl dgst -sha256 -binary | base64)
 
-(cd "${DATA_DIR}" && sha256sum "flatcar_production_update.gz") > "${UPDATE_CHECKSUM_PATH}"
+env --chdir "${DATA_DIR}" sha256sum "flatcar_production_update.gz" > "${UPDATE_CHECKSUM_PATH}"
 
 EXTRA_FILES=()
 EXTRA_SUMS=()