diff --git a/packages/eslint-plugin/src/util/explicitReturnTypeUtils.ts b/packages/eslint-plugin/src/util/explicitReturnTypeUtils.ts
index 56d4a267a2d..220cd081c0a 100644
--- a/packages/eslint-plugin/src/util/explicitReturnTypeUtils.ts
+++ b/packages/eslint-plugin/src/util/explicitReturnTypeUtils.ts
@@ -390,6 +390,7 @@ function ancestorHasReturnType(
     ancestor = ancestor.parent;
   }
 
+  /* istanbul ignore next */
   return false;
 }