diff --git a/test/unit/property-effects.html b/test/unit/property-effects.html
index 558f9c4c49..9501ea3393 100644
--- a/test/unit/property-effects.html
+++ b/test/unit/property-effects.html
@@ -215,7 +215,7 @@
   });
 
   test('no read-only observer called with assignment', function() {
-    el.readolyvalue = 46;
+    el.readonlyvalue = 46;
     assert.equal(el.observerCounts.readonlyvalueChanged, 0, 'observer should not be called for readOnly prop assignment');
   });