diff --git a/tests/phpunit/tests/db.php b/tests/phpunit/tests/db.php
index 83770d5fde..1d771174a8 100644
--- a/tests/phpunit/tests/db.php
+++ b/tests/phpunit/tests/db.php
@@ -98,7 +98,7 @@ class Tests_DB extends WP_UnitTestCase {
 		$this->assertNotEmpty( $dbh );
 		$this->assertTrue( isset( $wpdb->dbh ) ); // Test __isset()
 		unset( $wpdb->dbh );
-		$this->assertNull( $wpdb->dbh );
+		$this->assertTrue( empty( $wpdb->dbh ) );
 		$wpdb->dbh = $dbh;
 		$this->assertNotEmpty( $wpdb->dbh );
 	}
@@ -109,12 +109,12 @@ class Tests_DB extends WP_UnitTestCase {
 	function test_wpdb_nonexistent_properties() {
 		global $wpdb;
 
-		$this->assertNull( $wpdb->nonexistent_property );
+		$this->assertTrue( empty( $wpdb->nonexistent_property ) );
 		$wpdb->nonexistent_property = true;
 		$this->assertTrue( $wpdb->nonexistent_property );
 		$this->assertTrue( isset( $wpdb->nonexistent_property ) );
 		unset( $wpdb->nonexistent_property );
-		$this->assertNull( $wpdb->nonexistent_property );
+		$this->assertTrue( empty( $wpdb->nonexistent_property ) );
 	}
 
 	/**