diff --git a/test/pummel/test-crypto-dh.js b/test/pummel/test-crypto-dh.js
index a2bbf49af0c4ff..03be3ab7ad48e2 100644
--- a/test/pummel/test-crypto-dh.js
+++ b/test/pummel/test-crypto-dh.js
@@ -20,8 +20,8 @@ assert.throws(
   function() {
     crypto.getDiffieHellman('modp1').setPrivateKey('');
   },
-  new RegExp(/^TypeError: crypto\.getDiffieHellman\(\.\.\.\)\./.source +
-  /setPrivateKey is not a function$/.source),
+  new RegExp('^TypeError: crypto\\.getDiffieHellman\\(\\.\\.\\.\\)\\.' +
+  'setPrivateKey is not a function$'),
   'crypto.getDiffieHellman(\'modp1\').setPrivateKey(\'\') ' +
   'failed to throw the expected error.'
 );
@@ -29,8 +29,8 @@ assert.throws(
   function() {
     crypto.getDiffieHellman('modp1').setPublicKey('');
   },
-  new RegExp(/^TypeError: crypto\.getDiffieHellman\(\.\.\.\)\./.source +
-  /setPublicKey is not a function$/.source),
+  new RegExp('^TypeError: crypto\\.getDiffieHellman\\(\\.\\.\\.\\)\\.' +
+  'setPublicKey is not a function$'),
   'crypto.getDiffieHellman(\'modp1\').setPublicKey(\'\') ' +
   'failed to throw the expected error.'
 );