diff --git a/lib/utils.js b/lib/utils.js
index 5c292479b7..cc84a07631 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -663,10 +663,6 @@ exports.stackTraceFilter = function() {
       ? process.cwd() + slash
       : (typeof location === 'undefined' ? window.location : location).href.replace(/\/[^\/]*$/, '/');
 
-  function isNodeModule (line) {
-    return (~line.indexOf('node_modules'));
-  }
-
   function isMochaInternal (line) {
     return (~line.indexOf('node_modules' + slash + 'mocha'))  ||
       (~line.indexOf('components' + slash + 'mochajs'))       ||
@@ -692,9 +688,7 @@ exports.stackTraceFilter = function() {
     stack = stack.split('\n');
 
     stack = exports.reduce(stack, function(list, line) {
-      if (is.node && (isNodeModule(line) ||
-        isMochaInternal(line) ||
-        isNodeInternal(line)))
+      if (is.node && (isMochaInternal(line) || isNodeInternal(line)))
         return list;
 
       if (is.browser && (isBrowserModule(line)))
diff --git a/test/integration/helpers.js b/test/integration/helpers.js
index eea8b185fb..7187d9d7e7 100644
--- a/test/integration/helpers.js
+++ b/test/integration/helpers.js
@@ -98,7 +98,7 @@ module.exports = {
 
     // Ignore empty lines before/after diff
     return diffs.map(function(diff) {
-      return diff.slice(1, -1).join('\n');
+      return diff.slice(1, -2).join('\n');
     });
   }
 };
diff --git a/test/utils.js b/test/utils.js
index 524a0e0519..31b49893ca 100644
--- a/test/utils.js
+++ b/test/utils.js
@@ -97,7 +97,8 @@ describe('utils', function() {
           , 'next (/usr/local/lib/node_modules/mocha/lib/runner.js:248:23)'
           , 'Immediate._onImmediate (/usr/local/lib/node_modules/mocha/lib/runner.js:276:5)'
           , 'at processImmediate [as _immediateCallback] (timers.js:321:17)'];
-        filter(stack.join('\n')).should.equal(stack.slice(0,2).concat(stack.slice(5,7)).join('\n'));
+
+        filter(stack.join('\n')).should.equal(stack.slice(0,7).join('\n'));
       });
 
       it('should ignore bower and components files', function() {