diff --git a/dev/tests/integration/framework/tests/unit/testsuite/Magento/Test/Bootstrap/SettingsTest.php b/dev/tests/integration/framework/tests/unit/testsuite/Magento/Test/Bootstrap/SettingsTest.php
index 26e6b59ede06ddd04783773d05db5615f303fc27..9964ec7f8c508414c7a13f0716b896694f014e09 100644
--- a/dev/tests/integration/framework/tests/unit/testsuite/Magento/Test/Bootstrap/SettingsTest.php
+++ b/dev/tests/integration/framework/tests/unit/testsuite/Magento/Test/Bootstrap/SettingsTest.php
@@ -200,7 +200,7 @@ class SettingsTest extends \PHPUnit\Framework\TestCase
     public function testGetAsConfigFileException($settingName, $expectedExceptionMsg)
     {
         $this->expectException(\Magento\Framework\Exception\LocalizedException::class);
-        $this->expectExceptionMessage($expectedExceptionMsg);
+        $this->expectExceptionMessage((string)$expectedExceptionMsg);
         $this->_object->getAsConfigFile($settingName);
     }