diff --git a/static/js/directives/pdfcanvas.js b/static/js/directives/pdfcanvas.js
index e4a11bfc..b425b2a7 100644
--- a/static/js/directives/pdfcanvas.js
+++ b/static/js/directives/pdfcanvas.js
@@ -266,6 +266,7 @@ define(['require', 'underscore', 'jquery', 'text!partials/pdfcanvas_sandbox.html
 			$scope.$on("$destroy", function() {
 				pdfCanvas.close();
 				pdfCanvas = null;
+				sandboxApi.destroy();
 			});
 
 			$scope.$watch("currentPageNumber", function(page, oldValue) {