diff --git a/test/parallel/test-crypto-dh-constructor.js b/test/parallel/test-crypto-dh-constructor.js
index 28747ac3a72..edf7ab08e44 100644
--- a/test/parallel/test-crypto-dh-constructor.js
+++ b/test/parallel/test-crypto-dh-constructor.js
@@ -5,17 +5,14 @@ if (!common.hasCrypto)
 
 const assert = require('assert');
 const crypto = require('crypto');
-const { hasOpenSSL, hasFIPS } = require('../common/crypto');
+const { hasFIPS } = require('../common/crypto');
 
-const size = hasFIPS(3) ?
-  2048 : (crypto.getFips() === 1 || hasOpenSSL(3) ? 1024 : 256);
-const dh1 = crypto.createDiffieHellman(size);
-const p1 = dh1.getPrime('buffer');
+const prime = crypto.getDiffieHellman('modp14').getPrime('buffer');
 
 {
   const DiffieHellman = crypto.DiffieHellman;
 
-  const dh = DiffieHellman(p1, 'buffer');
+  const dh = DiffieHellman(prime, 'buffer');
   assert(dh instanceof DiffieHellman, 'DiffieHellman is expected to return a ' +
                                       'new instance when called without `new`');
 }
diff --git a/test/parallel/test-crypto-dh-generate-keys.js b/test/parallel/test-crypto-dh-generate-keys.js
index d074ba95751..65efb369c08 100644
--- a/test/parallel/test-crypto-dh-generate-keys.js
+++ b/test/parallel/test-crypto-dh-generate-keys.js
@@ -6,11 +6,9 @@ if (!common.hasCrypto)
 
 const assert = require('assert');
 const crypto = require('crypto');
-const { hasOpenSSL, hasFIPS } = require('../common/crypto');
 
 {
-  const size = hasFIPS(3) ?
-    2048 : (crypto.getFips() === 1 || hasOpenSSL(3) ? 1024 : 256);
+  const prime = crypto.getDiffieHellman('modp14').getPrime();
 
   function unlessInvalidState(f) {
     try {
@@ -23,7 +21,7 @@ const { hasOpenSSL, hasFIPS } = require('../common/crypto');
   }
 
   function testGenerateKeysChangesKeys(setup, expected) {
-    const dh = crypto.createDiffieHellman(size);
+    const dh = crypto.createDiffieHellman(prime);
     setup(dh);
     const firstPublicKey = unlessInvalidState(() => dh.getPublicKey());
     const firstPrivateKey = unlessInvalidState(() => dh.getPrivateKey());
diff --git a/test/parallel/test-crypto-dh-leak.js b/test/parallel/test-crypto-dh-leak.js
index 8d5141eef4b..f58a5a152b7 100644
--- a/test/parallel/test-crypto-dh-leak.js
+++ b/test/parallel/test-crypto-dh-leak.js
@@ -9,13 +9,11 @@ if (common.isASan)
 
 const assert = require('assert');
 const crypto = require('crypto');
-const { hasOpenSSL, hasFIPS } = require('../common/crypto');
 
 const before = process.memoryUsage.rss();
 {
-  const size = hasFIPS(3) ?
-    2048 : (crypto.getFips() === 1 || hasOpenSSL(3) ? 1024 : 256);
-  const dh = crypto.createDiffieHellman(size);
+  const prime = crypto.getDiffieHellman('modp14').getPrime();
+  const dh = crypto.createDiffieHellman(prime);
   const publicKey = dh.generateKeys();
   const privateKey = dh.getPrivateKey();
   for (let i = 0; i < 5e4; i += 1) {