diff --git a/lib/vector.js b/lib/vector.js
index 0351a531..1a98aabe 100644
--- a/lib/vector.js
+++ b/lib/vector.js
@@ -47,6 +47,11 @@ lunr.Vector.prototype.insert = function (idx, val) {
     return this.length++
   }
 
+  if (idx < list.idx) {
+    this.list = new lunr.Vector.Node (idx, val, list)
+    return this.length++
+  }
+
   var prev = list,
       next = list.next
 
diff --git a/test/vector_test.js b/test/vector_test.js
index f9375b27..95d182e7 100644
--- a/test/vector_test.js
+++ b/test/vector_test.js
@@ -37,3 +37,15 @@ test("calculating the similarity between two vectors", function () {
   equal(roundedSimilarity, 0.111)
 })
 
+test("inserted elements are kept in index order", function () {
+  var vector = new lunr.Vector,
+      elements = [6,5,4]
+
+  vector.insert(2, 4)
+  vector.insert(1, 5)
+  vector.insert(0, 6)
+
+  equal(vector.list.idx, 0)
+  equal(vector.list.next.idx, 1)
+  equal(vector.list.next.next.idx, 2)
+})