diff --git a/core/utils.js b/core/utils.js
index 25d4a58ab..3b7d84142 100644
--- a/core/utils.js
+++ b/core/utils.js
@@ -434,7 +434,7 @@ Blockly.utils.is3dSupported = function() {
   }
   // CC-BY-SA Lorenzo Polidori
   // stackoverflow.com/questions/5661671/detecting-transform-translate3d-support
-  if (!Blockly.utils.global.getComputedStyle) {
+  if (!Blockly.utils.global['getComputedStyle']) {
     return false;
   }
 
@@ -454,7 +454,7 @@ Blockly.utils.is3dSupported = function() {
   for (var t in transforms) {
     if (el.style[t] !== undefined) {
       el.style[t] = 'translate3d(1px,1px,1px)';
-      var computedStyle = Blockly.utils.global.getComputedStyle(el);
+      var computedStyle = Blockly.utils.global['getComputedStyle'](el);
       if (!computedStyle) {
         // getComputedStyle in Firefox returns null when Blockly is loaded
         // inside an iframe with display: none.  Returning false and not
diff --git a/core/utils/useragent.js b/core/utils/useragent.js
index 84d036d57..453fa01d2 100644
--- a/core/utils/useragent.js
+++ b/core/utils/useragent.js
@@ -107,4 +107,4 @@ Blockly.utils.userAgent.MOBILE;
   Blockly.utils.userAgent.MOBILE = !Blockly.utils.userAgent.TABLET &&
       (Blockly.utils.userAgent.IPOD || Blockly.utils.userAgent.IPHONE ||
        Blockly.utils.userAgent.ANDROID || has('IEMobile'));
-})((Blockly.utils.global.navigator && Blockly.utils.global.navigator.userAgent) || '');
+})((Blockly.utils.global['navigator'] && Blockly.utils.global['navigator']['userAgent']) || '');