diff --git a/mongodb/src/main/resources/logback.xml b/mongodb/src/main/resources/logback.xml
index dfbfeb2b..73354e06 100644
--- a/mongodb/src/main/resources/logback.xml
+++ b/mongodb/src/main/resources/logback.xml
@@ -1,32 +1,32 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <!-- 
 Copyright (c) 2016 YCSB contributors. All rights reserved.
 
 Licensed under the Apache License, Version 2.0 (the "License"); you
 may not use this file except in compliance with the License. You
 may obtain a copy of the License at
 
 http://www.apache.org/licenses/LICENSE-2.0
 
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 implied. See the License for the specific language governing
 permissions and limitations under the License. See accompanying
 LICENSE file.
 -->
-<?xml version="1.0" encoding="UTF-8"?>
 <configuration>
 	<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
 		<encoder>
 			<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
 		</encoder>
 	</appender>
 
 	<logger name="org.mongodb" level="WARN">
 		<appender-ref ref="STDOUT"/>
 	</logger>
 
 	<root level="INFO">
 		<appender-ref ref="STDOUT"/>
 	</root>
 </configuration>