diff --git a/lib/manager/nuget/extract.ts b/lib/manager/nuget/extract.ts
index 0538acd82e34a08dd6ec09b4ef4fbd6b01121dbb..5337f3fdd6ad8a9fdd528e74aef5bb0358902840 100644
--- a/lib/manager/nuget/extract.ts
+++ b/lib/manager/nuget/extract.ts
@@ -64,7 +64,7 @@ async function determineRegistryUrls(
 export async function extractPackageFile(
   content: string,
   packageFile: string,
-  config: ExtractConfig = {}
+  config: ExtractConfig
 ): Promise<PackageFile> {
   logger.trace({ packageFile }, 'nuget.extractPackageFile()');
   const { isVersion } = get(config.versioning || semverVersioning.id);