diff --git a/otr.py b/otr.py
index c57c2d4..7f76e09 100644
--- a/otr.py
+++ b/otr.py
@@ -176,4 +176,5 @@ class OTR(context.Account):
             event.encrypted, event.additional_data["encrypted"] = OTR.ENCRYPTION_NAME, {"name":OTR.ENCRYPTION_NAME} # some mandatory encryption flags
             if channel.resource:
                 event.stanza.addChild('no-copy', namespace='urn:xmpp:hints') # don't send carbons
+                event.stanza.addChild('no-store', namespace='urn:xmpp:hints') # don't store in MAM
             callback(event)
diff --git a/plugin-manifest.json b/plugin-manifest.json
index 834b1a7..4c6ac3d 100644
--- a/plugin-manifest.json
+++ b/plugin-manifest.json
@@ -17,5 +17,5 @@
     "gajim>=1.6,<1.9"
   ],
   "short_name": "otrplugin",
-  "version": "0.5.1"
+  "version": "0.5.2"
 }