diff --git a/core/modules/navigation/tests/src/FunctionalJavascript/PerformanceTest.php b/core/modules/navigation/tests/src/FunctionalJavascript/PerformanceTest.php
index b7220b72ba16837fd2de8badecbd6fc723fa2f36..5a25d2a71eec888024ec9a22443408a8cd894c13 100644
--- a/core/modules/navigation/tests/src/FunctionalJavascript/PerformanceTest.php
+++ b/core/modules/navigation/tests/src/FunctionalJavascript/PerformanceTest.php
@@ -80,7 +80,7 @@ public function testLogin(): void {
     $this->assertSame(0, $performance_data->getCacheTagInvalidationCount());
     $this->assertSame(1, $performance_data->getStyleSheetCount());
     $this->assertSame(2, $performance_data->getScriptCount());
-    $this->assertLessThan(90000, $performance_data->getStylesheetBytes());
+    $this->assertLessThan(90200, $performance_data->getStylesheetBytes());
     $this->assertLessThan(220000, $performance_data->getScriptBytes());
 
     // Check that the navigation toolbar is cached without any high-cardinality