diff --git a/src/services/__tests__/models/Callback.test.ts b/src/services/__tests__/models/Callback.test.ts
index 11f1d6a8..d79d89dc 100644
--- a/src/services/__tests__/models/Callback.test.ts
+++ b/src/services/__tests__/models/Callback.test.ts
@@ -6,9 +6,9 @@ const opts = new RedocNormalizedOptions({});
 
 describe('Models', () => {
   describe('CallbackModel', () => {
-    let parser;
+    // eslint-disable-next-line @typescript-eslint/no-var-requires
     const spec = require('../fixtures/callback.json');
-    parser = new OpenAPIParser(spec, undefined, opts);
+    const parser = new OpenAPIParser(spec, undefined, opts);
 
     test('basic callback details', () => {
       const callback = new CallbackModel(