diff --git a/src/main/resources/logback.xml b/src/main/resources/logback.xml
index 751726a..830ef37 100644
--- a/src/main/resources/logback.xml
+++ b/src/main/resources/logback.xml
@@ -1,4 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE xml>
+
 <configuration scan="true" scanPeriod="30 seconds">
 
     <contextListener class="ch.qos.logback.classic.jul.LevelChangePropagator">