diff --git a/sessionmanager/smg_event.go b/sessionmanager/smg_event.go
index 643c8693f..ced2b5e0c 100644
--- a/sessionmanager/smg_event.go
+++ b/sessionmanager/smg_event.go
@@ -228,7 +228,7 @@ func (self SMGenericEvent) GetCdrSource() string {
 func (self SMGenericEvent) GetExtraFields() map[string]string {
 	extraFields := make(map[string]string)
 	for key, val := range self {
-		primaryFields := append(utils.PrimaryCdrFields, utils.EVENT_NAME, utils.LastUsed)
+		primaryFields := append(utils.PrimaryCdrFields, utils.EVENT_NAME)
 		if utils.IsSliceMember(primaryFields, key) {
 			continue
 		}