diff --git a/pdf.js b/pdf.js
index ad7747946..dde6beb17 100644
--- a/pdf.js
+++ b/pdf.js
@@ -3423,7 +3423,7 @@ var Page = (function() {
       
       var pe = this.pe = new PartialEvaluator();
       var IRQueue = {};
-      return this.IRQueue = pe.getIRQueue(content, xref, resources, IRQueue, fonts, images, this.pageNumber + "_");
+      return this.IRQueue = pe.getIRQueue(content, xref, resources, IRQueue, fonts, images, "p" + this.pageNumber + "_");
     },
     
     ensureFonts: function(fonts, callback) {
diff --git a/worker.js b/worker.js
index 5d0769d29..b71f1a878 100644
--- a/worker.js
+++ b/worker.js
@@ -111,7 +111,7 @@ var WorkerPDFDoc = (function() {
     
     this.pageCache = [];
     
-    var useWorker = false;
+    var useWorker = true;
     
     if (useWorker) {
       var worker = new Worker("../worker/boot.js");