diff --git a/lodash.src.js b/lodash.src.js
index c3dd1dc95..c3f45abd0 100644
--- a/lodash.src.js
+++ b/lodash.src.js
@@ -2893,8 +2893,7 @@
      * @private
      * @param {Array} array The sorted array to inspect.
      * @param {*} value The value to evaluate.
-     * @param {boolean} [retHighest] Specify returning the highest, instead
-     *  of the lowest, index at which a value should be inserted into `array`.
+     * @param {boolean} [retHighest] Specify returning the highest qualified index.
      * @returns {number} Returns the index at which `value` should be inserted
      *  into `array`.
      */
@@ -2927,8 +2926,7 @@
      * @param {Array} array The sorted array to inspect.
      * @param {*} value The value to evaluate.
      * @param {Function} iteratee The function invoked per iteration.
-     * @param {boolean} [retHighest] Specify returning the highest, instead
-     *  of the lowest, index at which a value should be inserted into `array`.
+     * @param {boolean} [retHighest] Specify returning the highest qualified index.
      * @returns {number} Returns the index at which `value` should be inserted
      *  into `array`.
      */
@@ -3663,6 +3661,22 @@
       return wrapper;
     }
 
+    /**
+     * Creates a `_.sortedIndex` or `_.sortedLastIndex` function.
+     *
+     * @private
+     * @param {boolean} [retHighest] Specify returning the highest qualified index.
+     * @returns {Function} Returns the new index function.
+     */
+    function createSortedIndex(retHighest) {
+      return function(array, value, iteratee, thisArg) {
+        var func = getCallback(iteratee);
+        return (func === baseCallback && iteratee == null)
+          ? binaryIndex(array, value, retHighest)
+          : binaryIndexBy(array, value, func(iteratee, thisArg, 1), retHighest);
+      };
+    }
+
     /**
      * Creates a function that either curries or invokes `func` with optional
      * `this` binding and partially applied arguments.
@@ -5377,12 +5391,7 @@
      * _.sortedIndex([{ 'x': 30 }, { 'x': 50 }], { 'x': 40 }, 'x');
      * // => 1
      */
-    function sortedIndex(array, value, iteratee, thisArg) {
-      var func = getCallback(iteratee);
-      return (func === baseCallback && iteratee == null)
-        ? binaryIndex(array, value)
-        : binaryIndexBy(array, value, func(iteratee, thisArg, 1));
-    }
+    var sortedIndex = createSortedIndex();
 
     /**
      * This method is like `_.sortedIndex` except that it returns the highest
@@ -5404,12 +5413,7 @@
      * _.sortedLastIndex([4, 4, 5, 5], 5);
      * // => 4
      */
-    function sortedLastIndex(array, value, iteratee, thisArg) {
-      var func = getCallback(iteratee);
-      return (func === baseCallback && iteratee == null)
-        ? binaryIndex(array, value, true)
-        : binaryIndexBy(array, value, func(iteratee, thisArg, 1), true);
-    }
+    var sortedLastIndex = createSortedIndex(true);
 
     /**
      * Creates a slice of `array` with `n` elements taken from the beginning.