diff --git a/src/main/java/org/gcube/social_networking/socialnetworking/model/beans/workspace/WorkspaceEvent.java b/src/main/java/org/gcube/social_networking/socialnetworking/model/beans/workspace/WorkspaceEvent.java
index fa1a2bb..a0d2ac0 100644
--- a/src/main/java/org/gcube/social_networking/socialnetworking/model/beans/workspace/WorkspaceEvent.java
+++ b/src/main/java/org/gcube/social_networking/socialnetworking/model/beans/workspace/WorkspaceEvent.java
@@ -1,6 +1,7 @@
 package org.gcube.social_networking.socialnetworking.model.beans.workspace;
 
 import javax.validation.constraints.NotNull;
+import javax.ws.rs.DefaultValue;
 
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import com.fasterxml.jackson.annotation.JsonProperty;
@@ -33,6 +34,7 @@ public abstract class WorkspaceEvent {
 	 * @documentationExample false, optionl field, set to true if the idsToNotify are contexts, default is false
 	 */
 	@JsonProperty("idsAsGroup")
+	@DefaultValue("false")
 	protected boolean idsAsGroup = false;
 	
 	WorkspaceEvent(WorkspaceEventType TYPE) {