diff --git a/main/src/ui/util/helper.vala b/main/src/ui/util/helper.vala
index 6421473e..4af2cf3c 100644
--- a/main/src/ui/util/helper.vala
+++ b/main/src/ui/util/helper.vala
@@ -62,7 +62,7 @@ public static async AvatarDrawer get_conversation_avatar_drawer(StreamInteractor
     return yield get_conversation_participants_avatar_drawer(stream_interactor, conversation, new Jid[0]);
 }
 
-public static async AvatarDrawer get_conversation_participants_avatar_drawer(StreamInteractor stream_interactor, Conversation conversation, Jid[] jids) {
+public static async AvatarDrawer get_conversation_participants_avatar_drawer(StreamInteractor stream_interactor, Conversation conversation, owned Jid[] jids) {
     AvatarManager avatar_manager = stream_interactor.get_module(AvatarManager.IDENTITY);
     MucManager muc_manager = stream_interactor.get_module(MucManager.IDENTITY);
     if (conversation.type_ != Conversation.Type.GROUPCHAT) {
diff --git a/xmpp-vala/src/core/stanza_writer.vala b/xmpp-vala/src/core/stanza_writer.vala
index c2f589df..ab51a948 100644
--- a/xmpp-vala/src/core/stanza_writer.vala
+++ b/xmpp-vala/src/core/stanza_writer.vala
@@ -18,7 +18,7 @@ public class StanzaWriter {
         yield write_data(s.data);
     }
 
-    private async void write_data(uint8[] data) throws XmlError {
+    private async void write_data(owned uint8[] data) throws XmlError {
         if (running) {
             queue.push_tail(new SourceFuncWrapper(write_data.callback));
             yield;