diff --git a/__tests__/main.test.ts b/__tests__/main.test.ts
index bc29404..fe17f02 100644
--- a/__tests__/main.test.ts
+++ b/__tests__/main.test.ts
@@ -88,7 +88,7 @@ it('Should match generated changelog (unspecified fromTag)', async () => {
 it('Should match generated changelog (refs)', async () => {
   jest.setTimeout(180000)
 
-  const configuration = readConfiguration('configuration.json')
+  const configuration = readConfiguration('configuration.json')!!
   const releaseNotes = new ReleaseNotes({
     owner: 'mikepenz',
     repo: 'release-changelog-builder-action',