diff --git a/lib/packet_mosq.c b/lib/packet_mosq.c
index 686006fc..b1dc84f9 100644
--- a/lib/packet_mosq.c
+++ b/lib/packet_mosq.c
@@ -141,7 +141,7 @@ int packet__queue(struct mosquitto *mosq, struct mosquitto__packet *packet)
 #endif
 	}
 
-	if(mosq->in_callback == false && mosq->threaded == false){
+	if(mosq->in_callback == false && mosq->threaded == mosq_ts_none){
 		return packet__write(mosq);
 	}else{
 		return MOSQ_ERR_SUCCESS;