diff --git a/src/utils.mjs b/src/utils.mjs
index a363507..f7a07fc 100644
--- a/src/utils.mjs
+++ b/src/utils.mjs
@@ -8,7 +8,7 @@ export async function getManifest(manifest) {
 	return data;
 };
 
-export function assertEnvKey(key, { checkTruthiness = true }) {
+export function assertEnvKey(key, { checkTruthiness = true } = {}) {
 	if (!(key in process.env)) {
 		console.error(`Must provide a ${key} environment variable`);
 		process.exit(1);