diff --git a/tests/vitest/federatedCertificate.spec.js b/tests/vitest/federatedCertificate.spec.js
index 02eda9330..863032903 100644
--- a/tests/vitest/federatedCertificate.spec.js
+++ b/tests/vitest/federatedCertificate.spec.js
@@ -245,14 +245,6 @@ function derOf(pem) {
 	)
 }
 
-/**
- * @param {Uint8Array} der DER bytes.
- * @return {string} A PEM certificate.
- */
-function pemOf(der) {
-	return `-----BEGIN CERTIFICATE-----\n${btoa(String.fromCharCode(...der))}\n-----END CERTIFICATE-----`
-}
-
 /**
  * @param {Uint8Array} der DER bytes.
  * @param {number} offset Where an element starts.