diff --git a/src/main/java/org/gcube/socialnetworking/socialtoken/SanitizedURL.java b/src/main/java/org/gcube/socialnetworking/socialtoken/SanitizedURL.java
index 5b51f78..2b59fd0 100644
--- a/src/main/java/org/gcube/socialnetworking/socialtoken/SanitizedURL.java
+++ b/src/main/java/org/gcube/socialnetworking/socialtoken/SanitizedURL.java
@@ -6,7 +6,7 @@ import java.util.Objects;
 
 public class SanitizedURL {
 	
-	private static String CHARACTERS_TO_REMOVE = "[\\.\\,\\;\\)\\:\\\"\\'\\”\\‘]";
+	private static String CHARACTERS_TO_REMOVE = "[\\.\\,\\;\\(\\)\\:\\\"\\'\\“\\”\\‘\\’\\«\\»]";
 	
 	protected String prefix;
 	protected String postfix;