diff --git a/fabricjs/fabricjs-tests.ts b/fabricjs/fabricjs-tests.ts
index b230e2249..df0d217e8 100644
--- a/fabricjs/fabricjs-tests.ts
+++ b/fabricjs/fabricjs-tests.ts
@@ -8,10 +8,10 @@ function sample1() {
 
     canvas.on({
         'object:moving': function (e) {
-            e.target.opacity = 0.5;
+            (<any>e.target).opacity = 0.5;
         },
         'object:modified': function (e) {
-            e.target.opacity = 1;
+			(<any>e.target).opacity = 1;
         }
     });