diff --git a/fhem/FHEM/10_MQTT2_DEVICE.pm b/fhem/FHEM/10_MQTT2_DEVICE.pm
index 0be434652..37f274a61 100644
--- a/fhem/FHEM/10_MQTT2_DEVICE.pm
+++ b/fhem/FHEM/10_MQTT2_DEVICE.pm
@@ -495,6 +495,7 @@ MQTT2_DEVICE_Rename($$)
   my ($new, $old) = @_;
   MQTT2_DEVICE_delReading($old);
   MQTT2_DEVICE_addReading($new, AttrVal($new, "readingList", ""));
+  $defs{$new}{DEVICETOPIC} = $new;
   return undef;
 }