diff --git a/lib/datasource/helm/common.spec.ts b/lib/datasource/helm/common.spec.ts
index e2f1f32dbfd3910212c54e129ed555c68186dcc8..5cc8818db5277b4f2a819809fec417f05932e4a3 100644
--- a/lib/datasource/helm/common.spec.ts
+++ b/lib/datasource/helm/common.spec.ts
@@ -15,7 +15,7 @@ describe('datasource/helm/common', () => {
       ${'airflow'}  | ${{ sourceUrl: 'https://github.com/bitnami/charts', sourceDirectory: 'bitnami/airflow' }}
       ${'coredns'}  | ${{ sourceUrl: 'https://github.com/coredns/helm', sourceDirectory: undefined }}
       ${'pgadmin4'} | ${{ sourceUrl: 'https://github.com/rowanruseler/helm-charts', sourceDirectory: undefined }}
-      ${'dummy'}    | ${undefined}
+      ${'dummy'}    | ${{}}
     `(
       '$input -> $output',
       ({ input, output }: { input: string; output: string }) => {
diff --git a/lib/datasource/helm/common.ts b/lib/datasource/helm/common.ts
index 26cb20d308aefbc39c6f6212e0efa8f3448b78f8..c183ad7c5ef0d2f0e590ef344c1530e4e423b8fa 100644
--- a/lib/datasource/helm/common.ts
+++ b/lib/datasource/helm/common.ts
@@ -22,7 +22,7 @@ export function findSourceUrl(release: HelmRelease): RepoSource {
   }
 
   if (!release.sources?.length) {
-    return undefined;
+    return {};
   }
 
   for (const url of release.sources) {