diff --git a/packages/opentelemetry-exporter-collector/test/common/CollectorExporter.test.ts b/packages/opentelemetry-exporter-collector/test/common/CollectorExporter.test.ts
index 60d482129b8..40beaa641e2 100644
--- a/packages/opentelemetry-exporter-collector/test/common/CollectorExporter.test.ts
+++ b/packages/opentelemetry-exporter-collector/test/common/CollectorExporter.test.ts
@@ -30,6 +30,7 @@ class CollectorExporter extends CollectorExporterBase<CollectorExporterConfig> {
   onInit() {}
   onShutdown() {}
   sendSpans() {}
+  defaultURL(url: string | undefined) {return url || "";}
 }
 
 describe('CollectorExporter - common', () => {