diff --git a/lib/eslint/flat-eslint.js b/lib/eslint/flat-eslint.js
index 9d511aab2e8..f2d6082eb3c 100644
--- a/lib/eslint/flat-eslint.js
+++ b/lib/eslint/flat-eslint.js
@@ -576,7 +576,6 @@ class FlatESLint {
             cacheFilePath,
             lintResultCache,
             defaultConfigs,
-            defaultIgnores: () => false,
             configs: null
         });