diff --git a/backbone.js b/backbone.js
index b1a58165..4b151da2 100644
--- a/backbone.js
+++ b/backbone.js
@@ -834,16 +834,6 @@
       return this;
     },
 
-    // Figure out the smallest index at which a model should be inserted so as
-    // to maintain order.
-    sortedIndex: function(model, value, context) {
-      value || (value = this.comparator);
-      var iterator = _.isFunction(value) ? value : function(model) {
-        return model.get(value);
-      };
-      return _.sortedIndex(this.models, model, iterator, context);
-    },
-
     // Pluck an attribute from each model in the collection.
     pluck: function(attr) {
       return _.invoke(this.models, 'get', attr);
diff --git a/index.html b/index.html
index a06f7e39..4f893b7e 100644
--- a/index.html
+++ b/index.html
@@ -1686,7 +1686,6 @@ alert(JSON.stringify(collection));
       <li><a href="http://underscorejs.org/#min">min</a></li>
       <li><a href="http://underscorejs.org/#sortBy">sortBy</a></li>
       <li><a href="http://underscorejs.org/#groupBy">groupBy</a></li>
-      <li><a href="http://underscorejs.org/#sortedIndex">sortedIndex</a></li>
       <li><a href="http://underscorejs.org/#shuffle">shuffle</a></li>
       <li><a href="http://underscorejs.org/#toArray">toArray</a></li>
       <li><a href="http://underscorejs.org/#size">size</a></li>
diff --git a/test/collection.js b/test/collection.js
index 05b5af7f..f47644ca 100644
--- a/test/collection.js
+++ b/test/collection.js
@@ -522,18 +522,6 @@ $(document).ready(function() {
     deepEqual(col.difference([c, d]), [a, b]);
   });
 
-  test("sortedIndex", function () {
-    var model = new Backbone.Model({key: 2});
-    var collection = new (Backbone.Collection.extend({
-      comparator: 'key'
-    }))([model, {key: 1}]);
-    equal(collection.sortedIndex(model), 1);
-    equal(collection.sortedIndex(model, 'key'), 1);
-    equal(collection.sortedIndex(model, function (model) {
-      return model.get('key');
-    }), 1);
-  });
-
   test("reset", 12, function() {
     var resetCount = 0;
     var models = col.models;