diff --git a/backbone.js b/backbone.js
index 75d3f048..f1728acc 100644
--- a/backbone.js
+++ b/backbone.js
@@ -548,7 +548,7 @@
   var Collection = Backbone.Collection = function(models, options) {
     options || (options = {});
     if (options.model) this.model = options.model;
-    if (options.comparator) this.comparator = options.comparator;
+    if (options.comparator !== undefined) this.comparator = options.comparator;
     this._reset();
     this.initialize.apply(this, arguments);
     if (models) this.reset(models, {silent: true, parse: options.parse});
diff --git a/test/collection.js b/test/collection.js
index 5befc9c3..4b764bc1 100644
--- a/test/collection.js
+++ b/test/collection.js
@@ -606,4 +606,18 @@ $(document).ready(function() {
     ok(!collection.get('undefined'));
   });
 
+  test("Collection: falsy comparator", function(){
+    var Col = Backbone.Collection.extend({
+      comparator: function(model){ return model.id; }
+    });
+    var col = new Col
+    var colFalse = new Col(null, {comparator: false});
+    var colNull = new Col(null, {comparator: null});
+    var colUndefined = new Col(null, {comparator: undefined});
+    ok(col.comparator);
+    ok(!colFalse.comparator);
+    ok(!colNull.comparator);
+    ok(colUndefined.comparator);
+  });
+
 });