diff --git a/modules/apps/headless/headless-admin-site/headless-admin-site-test/src/testIntegration/java/com/liferay/headless/admin/site/resource/v1_0/test/WidgetPageWidgetInstanceResourceTest.java b/modules/apps/headless/headless-admin-site/headless-admin-site-test/src/testIntegration/java/com/liferay/headless/admin/site/resource/v1_0/test/WidgetPageWidgetInstanceResourceTest.java
index f985f66ba756e0..00623c3d05fb01 100644
--- a/modules/apps/headless/headless-admin-site/headless-admin-site-test/src/testIntegration/java/com/liferay/headless/admin/site/resource/v1_0/test/WidgetPageWidgetInstanceResourceTest.java
+++ b/modules/apps/headless/headless-admin-site/headless-admin-site-test/src/testIntegration/java/com/liferay/headless/admin/site/resource/v1_0/test/WidgetPageWidgetInstanceResourceTest.java
@@ -205,17 +205,17 @@ protected WidgetPageWidgetInstance randomWidgetPageWidgetInstance()
 		WidgetPageWidgetInstance widgetPageWidgetInstance =
 			new WidgetPageWidgetInstance();
 
-		String widgetName = AssetPublisherPortletKeys.ASSET_PUBLISHER;
-		String widgetInstanceId = RandomTestUtil.randomString();
+		String portletName = AssetPublisherPortletKeys.ASSET_PUBLISHER;
 
-		widgetPageWidgetInstance.setExternalReferenceCode(
-			widgetName + "_INSTANCE_" + widgetInstanceId);
+		String portletId = PortletIdCodec.encode(portletName);
+
+		widgetPageWidgetInstance.setExternalReferenceCode(portletId);
 
 		widgetPageWidgetInstance.setParentSectionId("column-1");
 		widgetPageWidgetInstance.setPosition(_position++);
-		widgetPageWidgetInstance.setWidgetName(widgetName);
-
-		widgetPageWidgetInstance.setWidgetInstanceId(widgetInstanceId);
+		widgetPageWidgetInstance.setWidgetInstanceId(
+			PortletIdCodec.decodeInstanceId(portletId));
+		widgetPageWidgetInstance.setWidgetName(portletName);
 
 		return widgetPageWidgetInstance;
 	}