diff --git a/src/main/java/org/gcube/portlets/user/tdwx/client/model/util/ColumnConfigGenerator.java b/src/main/java/org/gcube/portlets/user/tdwx/client/model/util/ColumnConfigGenerator.java
index 25ac807..1b54288 100644
--- a/src/main/java/org/gcube/portlets/user/tdwx/client/model/util/ColumnConfigGenerator.java
+++ b/src/main/java/org/gcube/portlets/user/tdwx/client/model/util/ColumnConfigGenerator.java
@@ -57,8 +57,8 @@ public class ColumnConfigGenerator {
 						String style = "style='color: "
 								+ (value ? "green" : "black") + "'";
 
-						sb.appendHtmlConstant("<span " + style + " title='"+value+"'>"+
-								value+"</span>");
+						sb.appendHtmlConstant("<span " + style + " title='"+new SafeHtmlBuilder().append(value).toSafeHtml().asString()+"'>"+
+								new SafeHtmlBuilder().append(value).toSafeHtml().asString()+"</span>");
 					}
 				});
 			}