diff --git a/src/main/resources/io/jenkins/plugins/prism/Messages.properties b/src/main/resources/io/jenkins/plugins/prism/Messages.properties
index 5476a77..ee8ad18 100644
--- a/src/main/resources/io/jenkins/plugins/prism/Messages.properties
+++ b/src/main/resources/io/jenkins/plugins/prism/Messages.properties
@@ -1,5 +1,5 @@
 FieldValidator.Error.DefaultEncoding=Encoding must be a supported encoding of the Java platform, see: \
-  <a href="{0}">java.nio.charset.Charset</a>
+  <a rel="noopener noreferrer" href="{0}">java.nio.charset.Charset</a>
 SourceCodeRetention.NEVER=Never store source code
 SourceCodeRetention.LAST_BUILD=Store source code of last build only
 SourceCodeRetention.EVERY_BUILD=Store source code of every build