diff --git a/gcm-sender-async/src/test/resources/logback-test.xml b/gcm-sender-async/src/test/resources/logback-test.xml
index ecd9eb548..2b693894a 100644
--- a/gcm-sender-async/src/test/resources/logback-test.xml
+++ b/gcm-sender-async/src/test/resources/logback-test.xml
@@ -1,6 +1,8 @@
-<!-- Turning down the wiremock logging -->
-<logger name="com.github.tomakehurst.wiremock" level="WARN"/>
-<logger name="wiremock.org" level="ERROR"/>
-<logger name="WireMock" level="WARN"/>
-<!-- wiremock has per endpoint servlet logging -->
-<logger name="/" level="WARN"/>
+<configuration>
+  <!-- Turning down the wiremock logging -->
+  <logger name="com.github.tomakehurst.wiremock" level="WARN"/>
+  <logger name="wiremock.org" level="ERROR"/>
+  <logger name="WireMock" level="WARN"/>
+  <!-- wiremock has per endpoint servlet logging -->
+  <logger name="/" level="WARN"/>
+</configuration>