diff --git a/test/parallel/test-crypto-prime.js b/test/parallel/test-crypto-prime.js
index a53ee4f3e0417a..6f43e3a0bfbf29 100644
--- a/test/parallel/test-crypto-prime.js
+++ b/test/parallel/test-crypto-prime.js
@@ -258,11 +258,11 @@ for (const checks of [-(2 ** 31), -1, 2 ** 31, 2 ** 32 - 1, 2 ** 32, 2 ** 50]) {
   bytes[0] = 0x1;
   assert.throws(() => checkPrime(bytes, common.mustNotCall()), {
     code: 'ERR_OSSL_BN_BIGNUM_TOO_LONG',
-    message: /bignum too long/
+    message: /bignum[_ ]too[_ ]long/i
   });
   assert.throws(() => checkPrimeSync(bytes), {
     code: 'ERR_OSSL_BN_BIGNUM_TOO_LONG',
-    message: /bignum too long/
+    message: /bignum[_ ]too[_ ]long/i
   });
 }