diff --git a/test/parallel/test-crypto-binary-default.js b/test/parallel/test-crypto-binary-default.js
index 8695632727fa80..9cc6bdb3e4faa5 100644
--- a/test/parallel/test-crypto-binary-default.js
+++ b/test/parallel/test-crypto-binary-default.js
@@ -513,7 +513,7 @@ assert.throws(function() {
 
 // Test Diffie-Hellman with two parties sharing a secret,
 // using various encodings as we go along
-var dh1 = crypto.createDiffieHellman(1024);
+var dh1 = crypto.createDiffieHellman(common.hasFipsCrypto ? 1024 : 256);
 var p1 = dh1.getPrime('buffer');
 var dh2 = crypto.createDiffieHellman(p1, 'base64');
 var key1 = dh1.generateKeys();
diff --git a/test/parallel/test-crypto-dh.js b/test/parallel/test-crypto-dh.js
index d93c53e3997dae..322b5d1c70a073 100644
--- a/test/parallel/test-crypto-dh.js
+++ b/test/parallel/test-crypto-dh.js
@@ -11,7 +11,7 @@ var crypto = require('crypto');
 
 // Test Diffie-Hellman with two parties sharing a secret,
 // using various encodings as we go along
-var dh1 = crypto.createDiffieHellman(1024);
+var dh1 = crypto.createDiffieHellman(common.hasFipsCrypto ? 1024 : 256);
 var p1 = dh1.getPrime('buffer');
 var dh2 = crypto.createDiffieHellman(p1, 'buffer');
 var key1 = dh1.generateKeys();