diff --git a/index.js b/index.js
index 8b65f8f..5387e4e 100644
--- a/index.js
+++ b/index.js
@@ -7,6 +7,7 @@
  */
 
 var type = require('type-detect');
+var compareFn = require('default-compare-with-symbol').defaultCompareWithSymbol;
 function FakeMap() {
   this._key = 'chai/deep-eql__' + Math.random() + Date.now();
 }
@@ -276,7 +277,7 @@ function entriesEqual(leftHandOperand, rightHandOperand, options) {
   rightHandOperand.forEach(function gatherEntries(key, value) {
     rightHandItems.push([ key, value ]);
   });
-  return iterableEqual(leftHandItems.sort(), rightHandItems.sort(), options);
+  return iterableEqual(leftHandItems.sort(compareFn), rightHandItems.sort(compareFn), options);
 }
 
 /*!
@@ -428,8 +429,8 @@ function objectEqual(leftHandOperand, rightHandOperand, options) {
     rightHandKeys = rightHandKeys.concat(rightHandSymbols);
   }
   if (leftHandKeys.length && leftHandKeys.length === rightHandKeys.length) {
-    leftHandKeys.sort();
-    rightHandKeys.sort();
+    leftHandKeys.sort(compareFn);
+    rightHandKeys.sort(compareFn);
     if (iterableEqual(leftHandKeys, rightHandKeys) === false) {
       return false;
     }
@@ -439,8 +440,8 @@ function objectEqual(leftHandOperand, rightHandOperand, options) {
   var leftHandEntries = getIteratorEntries(leftHandOperand);
   var rightHandEntries = getIteratorEntries(rightHandOperand);
   if (leftHandEntries.length && leftHandEntries.length === rightHandEntries.length) {
-    leftHandEntries.sort();
-    rightHandEntries.sort();
+    leftHandEntries.sort(compareFn);
+    rightHandEntries.sort(compareFn);
     return iterableEqual(leftHandEntries, rightHandEntries, options);
   }
 
diff --git a/package.json b/package.json
index bc2846a..7d7ff70 100644
--- a/package.json
+++ b/package.json
@@ -53,6 +53,7 @@
     }
   },
   "dependencies": {
+    "default-compare-with-symbol": "^1.0.1",
     "type-detect": "^4.0.0"
   },
   "devDependencies": {
diff --git a/test/index.js b/test/index.js
index 64909e8..de34ea2 100644
--- a/test/index.js
+++ b/test/index.js
@@ -416,6 +416,14 @@ describe('Generic', function () {
       var objectB = { [symb]: { [symb]: 'a' } };
       assert(eql(objectA, objectB) === false, 'eql(obj, obj) === false');
     });
+
+    it('issues#85', function () {
+      var objectA = new URL('https://github.com/');
+      var objectB = new URL('https://github.com/');
+      var objectC = new URL('https://github.com/chaijs/deep-eql');
+      assert(eql(objectA, objectB) === true, 'eql(obj, obj) === true');
+      assert(eql(objectA, objectC) === false, 'eql(obj, obj) === false');
+    });
   });