diff --git a/sat/plugins/plugin_sec_aesgcm.py b/sat/plugins/plugin_sec_aesgcm.py
index 773c2c37..453f2b5d 100644
--- a/sat/plugins/plugin_sec_aesgcm.py
+++ b/sat/plugins/plugin_sec_aesgcm.py
@@ -174,7 +174,7 @@ class AESGCM(object):
 
         for attachment in extra_attachments:
             # we send all remaining attachment in a separate message
-            client.sendMessage(
+            await client.sendMessage(
                 to_jid=data['to'],
                 message={'': ''},
                 subject=data['subject'],