diff --git a/scm-plugins/scm-svn-plugin/pom.xml b/scm-plugins/scm-svn-plugin/pom.xml
index e78a8221bb..254fa6730d 100644
--- a/scm-plugins/scm-svn-plugin/pom.xml
+++ b/scm-plugins/scm-svn-plugin/pom.xml
@@ -90,6 +90,15 @@
     </plugins>
   </build>
 
+  <properties>
+    <!--
+    SCMSvnDiffGenerator is a copy of an internal SVNKit class, with small changes for SCM-Manger.
+    If we refactor the class, it could become very hard to merge it with upstream.
+    So we do not want a duplication report for this class.
+    -->
+    <sonar.cpd.exclusions>**/SCMSvnDiffGenerator.java</sonar.cpd.exclusions>
+  </properties>
+
   <repositories>
 
     <repository>