diff --git a/redwood-testing/src/commonTest/kotlin/app/cash/redwood/testing/ViewRecyclingTester.kt b/redwood-testing/src/commonTest/kotlin/app/cash/redwood/testing/ViewRecyclingTester.kt
index d8de07da2f..026120e27f 100644
--- a/redwood-testing/src/commonTest/kotlin/app/cash/redwood/testing/ViewRecyclingTester.kt
+++ b/redwood-testing/src/commonTest/kotlin/app/cash/redwood/testing/ViewRecyclingTester.kt
@@ -40,6 +40,7 @@ import com.example.redwood.testapp.testing.TestSchemaTestingWidgetFactory
 import com.example.redwood.testapp.widget.TestSchemaWidgetSystem
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.coroutineScope
+import kotlinx.serialization.json.Json
 
 /**
  * Like [TestSchemaTester], but this also hooks up Redwood's protocol mechanism. That's necessary
@@ -64,7 +65,7 @@ class ViewRecyclingTester(
     container = widgetContainer,
     factory = widgetProtocolFactory,
     eventSink = { event ->
-      guestAdapter.sendEvent(event)
+      guestAdapter.sendEvent(event.toProtocol(Json.Default))
     },
   )