diff --git a/src/main/java/org/gcube/portlets/user/topics/server/TopicServiceImpl.java b/src/main/java/org/gcube/portlets/user/topics/server/TopicServiceImpl.java
index ea0ed7b..1d22087 100644
--- a/src/main/java/org/gcube/portlets/user/topics/server/TopicServiceImpl.java
+++ b/src/main/java/org/gcube/portlets/user/topics/server/TopicServiceImpl.java
@@ -349,7 +349,7 @@ public class TopicServiceImpl extends RemoteServiceServlet implements TopicServi
 		Map<String, Double> scoredListSorted = sortByWeight(weights);
 		for(Entry<String, Double> entry : scoredListSorted.entrySet()){
 
-			System.out.println("[hashtag=" + entry.getKey() + " , weight="  + entry.getValue() + "]");
+			_log.debug("[hashtag=" + entry.getKey() + " , weight="  + entry.getValue() + "]");
 		}
 
 		return weights;