diff --git a/static/js/controllers.js b/static/js/controllers.js
index 0935611e7..6b7599d59 100644
--- a/static/js/controllers.js
+++ b/static/js/controllers.js
@@ -785,7 +785,10 @@ function BuildPackageCtrl($scope, Restangular, ApiService, $routeParams, $rootSc
   };
 
   $scope.initializeTree = function() {
-    if ($scope.drawn) { return; }
+    if ($scope.drawn) {
+      $scope.tree.notifyResized();
+      return;
+    }
 
     $scope.drawn = true;
     $timeout(function() {
diff --git a/static/js/graphing.js b/static/js/graphing.js
index d73844ceb..b796fd8a4 100644
--- a/static/js/graphing.js
+++ b/static/js/graphing.js
@@ -857,10 +857,10 @@ FileTreeBase.prototype.calculateDimensions_ = function(container) {
 
   var margin = { top: 40, right: 00, bottom: 20, left: 20 };
   var m = [margin.top, margin.right, margin.bottom, margin.left];
-  var w = cw - m[1] - m[3];
-  var h = ch - m[0] - m[2];
+  var w = Math.max(0, cw - m[1] - m[3]);
+  var h = Math.max(0, ch - m[0] - m[2]);
 
-  var barWidth = cw * 0.8 - m[1] - m[3];
+  var barWidth = Math.max(0, cw * 0.8 - m[1] - m[3]);
 
   return {
     'w': w,