diff --git a/test/buildConfig.ts b/test/buildConfig.ts
index bd5693216e..09cc4dd41a 100644
--- a/test/buildConfig.ts
+++ b/test/buildConfig.ts
@@ -12,6 +12,8 @@ export function buildConfig(config?: Partial<Config>): Promise<SanitizedConfig>
     ...config,
   };
 
+  baseConfig.serverURL = baseConfig.serverURL || 'http://localhost:3000';
+
   baseConfig.admin = {
     ...(baseConfig.admin || {}),
     webpack: (webpackConfig) => {