diff --git a/fhem/CHANGED b/fhem/CHANGED
index a21a2855f..512dae2f2 100644
--- a/fhem/CHANGED
+++ b/fhem/CHANGED
@@ -1,5 +1,6 @@
 # Add changes at the top of the list. Keep it in ASCII, and 80-char wide.
 # Do not insert empty lines here, update check depends on it.
+  - bugfix:  00_MQTT: added delete 
   - new:     83_IOhomecontrol: control IOhomecontrol devices via REST API
   - feature: 31_PLAYBULB: add support for Candle S Firmware 1.4
   - feature: 73_GardenaSmartBridge: add attribut disabledForInterval
diff --git a/fhem/FHEM/00_MQTT.pm b/fhem/FHEM/00_MQTT.pm
index 0dc0f1303..6baefaab9 100644
--- a/fhem/FHEM/00_MQTT.pm
+++ b/fhem/FHEM/00_MQTT.pm
@@ -53,6 +53,7 @@ sub MQTT_Initialize($) {
   # Consumer
   $hash->{DefFn}      = "MQTT::Define";
   $hash->{UndefFn}    = "MQTT::Undef";
+  $hash->{DeleteFn}   = "MQTT::Delete";
   $hash->{ShutdownFn} = "MQTT::Shutdown";
   $hash->{SetFn}      = "MQTT::Set";
   $hash->{NotifyFn}   = "MQTT::Notify";
@@ -138,6 +139,13 @@ sub Undef($) {
   return undef;
 }
 
+sub Delete($$) {
+  my ($hash, $name) = @_;
+  setKeyValue($name."_user",undef);
+  setKeyValue($name."_pass",undef);
+  return undef;
+}
+
 sub Shutdown($) {
   my $hash = shift;
   Stop($hash);