diff --git a/lib/assert.js b/lib/assert.js
index 0458bb09816872..04c5cb5ad436e1 100644
--- a/lib/assert.js
+++ b/lib/assert.js
@@ -359,13 +359,14 @@ function _throws(shouldThrow, block, expected, message) {
 // 11. Expected to throw an error:
 // assert.throws(block, Error_opt, message_opt);
 
-assert.throws = function(block, /*optional*/error, /*optional*/message) {
+assert.throws = function throws(block, /*optional*/error, /*optional*/message) {
   _throws(true, block, error, message);
 };
 
 // EXTENSION! This is annoying to write outside this module.
-assert.doesNotThrow = function(block, /*optional*/error, /*optional*/message) {
+assert.doesNotThrow = doesNotThrow;
+function doesNotThrow(block, /*optional*/error, /*optional*/message) {
   _throws(false, block, error, message);
-};
+}
 
-assert.ifError = function(err) { if (err) throw err; };
+assert.ifError = function ifError(err) { if (err) throw err; };