diff --git a/accessible/jsat/Presentation.jsm b/accessible/jsat/Presentation.jsm
index a0b89e1cab2..f498638442f 100644
--- a/accessible/jsat/Presentation.jsm
+++ b/accessible/jsat/Presentation.jsm
@@ -691,6 +691,7 @@ this.Presentation = { // jshint ignore:line
   get displayedAccessibles() {
     delete this.displayedAccessibles;
     this.displayedAccessibles = new WeakMap();
+    return this.displayedAccessibles;
   },
 
   pivotChanged: function Presentation_pivotChanged(