diff --git a/core/modules/outside_in/tests/src/FunctionalJavascript/OutsideInJavascriptTestBase.php b/core/modules/outside_in/tests/src/FunctionalJavascript/OutsideInJavascriptTestBase.php
index a07ff36..714d10a 100644
--- a/core/modules/outside_in/tests/src/FunctionalJavascript/OutsideInJavascriptTestBase.php
+++ b/core/modules/outside_in/tests/src/FunctionalJavascript/OutsideInJavascriptTestBase.php
@@ -94,7 +94,7 @@ protected function getTray() {
    *   (optional) Timeout in milliseconds, defaults to 10000.
    */
   protected function waitForNoElement($selector, $timeout = 10000) {
-    $condition = "(typeof jQuery !== 'undefined' && jQuery('$selector').length == 0)";
+    $condition = "(typeof jQuery !== 'undefined' && jQuery('$selector').length === 0)";
     $this->assertJsCondition($condition, $timeout);
   }