diff --git a/obs-status-service/rabbitmq.go b/obs-status-service/rabbitmq.go
index 974ac8b..ee62ce1 100644
--- a/obs-status-service/rabbitmq.go
+++ b/obs-status-service/rabbitmq.go
@@ -120,7 +120,7 @@ func ProcessingObsMessages(host, username, password, queueName string) {
 	}()
 
 	var err error
-	out, err = os.OpenFile("messages.txt", os.O_WRONLY, 0644)
+	out, err = os.OpenFile("messages.txt", os.O_WRONLY | os.O_APPEND, 0644)
 	if err != nil {
 		log.Printf("Cannot open message.txt: %v", err)
 		return