diff --git a/tests/GlobalFunctionsTest.php b/tests/GlobalFunctionsTest.php
index 79f6602..15f64dd 100644
--- a/tests/GlobalFunctionsTest.php
+++ b/tests/GlobalFunctionsTest.php
@@ -400,6 +400,9 @@ public function testHydrate()
     hydrate(['' => ''], $source, []);
   }
 
+  /**
+   * @large
+   */
   public function testSingleBit()
   {
     $this->assertTrue(is_single_bit(1));