diff --git a/denorm.coffee b/denorm.coffee
index 9c985d8..b782684 100644
--- a/denorm.coffee
+++ b/denorm.coffee
@@ -110,6 +110,19 @@ J.denorm =
                     sparse: true
                 )
 
+                expireIndex = {}
+                expireIndex["_reactives.#{reactiveName}.expire"] = 1
+                reactiveModelClass.collection._ensureIndex(
+                    expireIndex
+                    name: "_jReactiveWatcher_#{reactiveName}_expire_1"
+                )
+                tsIndex = {}
+                tsIndex["_reactives.#{reactiveName}.ts"] = -1
+                reactiveModelClass.collection._ensureIndex(
+                    tsIndex
+                    name: "_jReactiveWatcher_#{reactiveName}_ts_-1"
+                )
+
 
     recalc: (instance, reactiveName, timestamp = new Date(), denormCallback) ->
         # Sets _reactives.#{reactiveName}.val and .watchers
diff --git a/package.js b/package.js
index 32645db..3e59147 100644
--- a/package.js
+++ b/package.js
@@ -9,7 +9,7 @@
 Package.describe({
     summary: "JFramework for Meteor + React",
     name: "quixey:jframework",
-    version: "1.5.1",
+    version: "1.5.2",
     git: "https://github.com/quixey/jframework.git"
 });