diff --git a/platform/features/layout/src/FixedController.js b/platform/features/layout/src/FixedController.js
index 465d6a1d3b..ec8ed503c5 100644
--- a/platform/features/layout/src/FixedController.js
+++ b/platform/features/layout/src/FixedController.js
@@ -250,7 +250,7 @@ define(
             // Position a panel after a drop event
             function handleDrop(e, id, position) {
                 // Don't handle this event if it has already been handled
-                if (e.isDefaultPrevented()) {
+                if (e.defaultPrevented) {
                     return;
                 }
                 e.preventDefault();
diff --git a/platform/features/layout/src/LayoutController.js b/platform/features/layout/src/LayoutController.js
index a3219667f9..1c58f92988 100644
--- a/platform/features/layout/src/LayoutController.js
+++ b/platform/features/layout/src/LayoutController.js
@@ -109,7 +109,7 @@ define(
 
             // Position a panel after a drop event
             function handleDrop(e, id, position) {
-                if (e.isDefaultPrevented()) {
+                if (e.defaultPrevented) {
                     return;
                 }
                 // Ensure that configuration field is populated
diff --git a/platform/features/layout/test/FixedControllerSpec.js b/platform/features/layout/test/FixedControllerSpec.js
index b4e05c9665..8f98391986 100644
--- a/platform/features/layout/test/FixedControllerSpec.js
+++ b/platform/features/layout/test/FixedControllerSpec.js
@@ -101,7 +101,7 @@ define(
                 );
                 mockEvent = jasmine.createSpyObj(
                     'event',
-                    [ 'preventDefault', 'isDefaultPrevented' ]
+                    [ 'preventDefault' ]
                 );
 
                 testGrid = [ 123, 456 ];
@@ -326,7 +326,7 @@ define(
 
             it("ignores drops when default has been prevented", function () {
                 // Avoids redundant drop-handling, WTD-1233
-                mockEvent.isDefaultPrevented.andReturn(true);
+                mockEvent.defaultPrevented = true;
 
                 // Notify that a drop occurred
                 testModel.composition.push('d');
diff --git a/platform/features/layout/test/LayoutControllerSpec.js b/platform/features/layout/test/LayoutControllerSpec.js
index d6cc3d035b..5ec80755f4 100644
--- a/platform/features/layout/test/LayoutControllerSpec.js
+++ b/platform/features/layout/test/LayoutControllerSpec.js
@@ -40,7 +40,7 @@ define(
                 );
                 mockEvent = jasmine.createSpyObj(
                     'event',
-                    [ 'preventDefault', 'isDefaultPrevented' ]
+                    [ 'preventDefault' ]
                 );
 
                 testModel = {
@@ -164,7 +164,7 @@ define(
 
             it("ignores drops when default has been prevented", function () {
                 // Avoids redundant drop-handling, WTD-1233
-                mockEvent.isDefaultPrevented.andReturn(true);
+                mockEvent.defaultPrevented = true;
 
                 // Notify that a drop occurred
                 testModel.composition.push('d');