diff --git a/src/middlewares/openapi.request.validator.ts b/src/middlewares/openapi.request.validator.ts
index 543a3eb2..515874ac 100644
--- a/src/middlewares/openapi.request.validator.ts
+++ b/src/middlewares/openapi.request.validator.ts
@@ -242,7 +242,7 @@ export class RequestValidator {
         throw validationError(415, path, msg);
       }
 
-      let bodyContentSchema =
+      const bodyContentSchema =
         requestBody.content[contentType.contentType] &&
         requestBody.content[contentType.contentType].schema;
       if (bodyContentSchema && '$ref' in bodyContentSchema) {