diff --git a/src/Standards/Generic/Tests/Debug/ESLintUnitTest.php b/src/Standards/Generic/Tests/Debug/ESLintUnitTest.php
index 824beae4ad..e035c2088c 100644
--- a/src/Standards/Generic/Tests/Debug/ESLintUnitTest.php
+++ b/src/Standards/Generic/Tests/Debug/ESLintUnitTest.php
@@ -52,6 +52,8 @@ protected function setUpPrerequisites()
         $cwd = getcwd();
         file_put_contents($cwd.'/.eslintrc.json', self::ESLINT_CONFIG);
 
+        putenv('ESLINT_USE_FLAT_CONFIG=false');
+
     }//end setUpPrerequisites()