diff --git a/src/com/sap/piper/JenkinsUtils.groovy b/src/com/sap/piper/JenkinsUtils.groovy
index e5bcfc738..d907fe0c0 100644
--- a/src/com/sap/piper/JenkinsUtils.groovy
+++ b/src/com/sap/piper/JenkinsUtils.groovy
@@ -32,7 +32,7 @@ static boolean addWarningsNGParser(String id, String name, String regex, String
         return false
     }else{
         io.jenkins.plugins.analysis.warnings.groovy.ParserConfiguration.getInstance().setParsers(
-            io.jenkins.plugins.analysis.warnings.groovy.ParserConfiguration.getInstance().getParsers().add(
+            io.jenkins.plugins.analysis.warnings.groovy.ParserConfiguration.getInstance().getParsers().plus(
                 new io.jenkins.plugins.analysis.warnings.groovy.GroovyParser(id, name, regex, script, example)
             )
         )