diff --git a/benchmarks/ensureIndex.js b/benchmarks/ensureIndex.js
new file mode 100644
index 0000000..4bc1c08
--- /dev/null
+++ b/benchmarks/ensureIndex.js
@@ -0,0 +1,51 @@
+var Datastore = require('../lib/datastore')
+  , benchDb = 'workspace/insert.bench.db'
+  , async = require('async')
+  , commonUtilities = require('./commonUtilities')
+  , execTime = require('exec-time')
+  , profiler = new execTime('INSERT BENCH')
+  , d = new Datastore(benchDb)
+  , program = require('commander')
+  , n
+  ;
+
+program
+  .option('-n --number [number]', 'Size of the collection to test on', parseInt)
+  .option('-i --with-index', 'Test with an index')
+  .parse(process.argv);
+
+n = program.number || 10000;
+
+console.log("----------------------------");
+console.log("Test with " + n + " documents");
+console.log("----------------------------");
+
+async.waterfall([
+  async.apply(commonUtilities.prepareDb, benchDb)
+, function (cb) {
+    d.loadDatabase(function (err) {
+      if (err) { return cb(err); }
+      cb();
+    });
+  }
+, function (cb) { profiler.beginProfiling(); return cb(); }
+, async.apply(commonUtilities.insertDocs, d, n, profiler)
+, function (cb) {
+    var i;
+
+    profiler.step('Begin calling ensureIndex ' + n + ' docs');
+
+    for (i = 0; i < n; i += 1) {
+      d.ensureIndex({ fieldName: 'docNumber' });
+      delete d.indexes.docNumber;
+    }
+
+    console.log("Average time for one ensureIndex: " + (profiler.elapsedSinceLastStep() / n) + "ms");
+    profiler.step('Finished calling ensureIndex ' + n + ' times');
+  }
+], function (err) {
+  profiler.step("Benchmark finished");
+
+  if (err) { return console.log("An error was encountered: ", err); }
+});
+