diff --git a/test/mixins/DefaultSlotContentMixin.tests.js b/test/mixins/DefaultSlotContentMixin.tests.js
index <HASH>..<HASH> 100644
--- a/test/mixins/DefaultSlotContentMixin.tests.js
+++ b/test/mixins/DefaultSlotContentMixin.tests.js
@@ -142,7 +142,8 @@ describe("DefaultSlotContentMixin", () => {
       // Wait for slotchange event to be processed.
       flushPolyfills();
       setTimeout(() => {
-        assert(fixture.contentChangedCallCount === 1);
+        assert(fixture.contentChangedCallCount === 1 /* WebKit, polyfil */
+            || fixture.contentChangedCallCount === 2 /* Blink */);
         done();
       });
     });
Workaround for unit test that was broken by recent slotchange tinkering in Blink.