diff --git a/fhem/FHEM/00_MQTT.pm b/fhem/FHEM/00_MQTT.pm
index 1b37d5c8f..9d86b8cbf 100644
--- a/fhem/FHEM/00_MQTT.pm
+++ b/fhem/FHEM/00_MQTT.pm
@@ -515,7 +515,7 @@ sub Read {
         GP_ForallClients($hash,\&notify_client_connected);
         foreach my $message_id (keys %{$hash->{messages}}) {
           my $msg = $hash->{messages}->{$message_id}->{message};
-          $msg->{dup} = 1;
+          $msg->{dup} = $msg->{ispub};
           DevIo_SimpleWrite($hash,$msg->bytes,undef);
         }
         last;