diff --git a/ARSnova-checkstyle-checker.xml b/ARSnova-checkstyle-checker.xml
index fcc018f257856b30b69c1dde5ee622611f52c767..f8ac6d85ee58bbe1fb6e3d8b215c99a43102f460 100644
--- a/ARSnova-checkstyle-checker.xml
+++ b/ARSnova-checkstyle-checker.xml
@@ -71,6 +71,7 @@
     <module name="TreeWalker">
 
         <property name="cacheFile" value="${checkstyle.cache.file}"/>
+        <property name="tabWidth" value="4"/>
 
         <!-- Checks for Javadoc comments.                     -->
         <!-- See http://checkstyle.sf.net/config_javadoc.html -->