diff --git a/fhem/FHEM/00_MQTT2_CLIENT.pm b/fhem/FHEM/00_MQTT2_CLIENT.pm
index 9a284f273..9c503ca39 100644
--- a/fhem/FHEM/00_MQTT2_CLIENT.pm
+++ b/fhem/FHEM/00_MQTT2_CLIENT.pm
@@ -56,6 +56,7 @@ MQTT2_CLIENT_Initialize($)
     subscriptions
     SSL
     sslargs
+    topicConversion:0,1
     username
   );
   use warnings 'qw';
@@ -517,7 +518,7 @@ MQTT2_CLIENT_Read($@)
     }
     $val = substr($pl, $off);
     if($unicodeEncoding) {
-      if(!$hash->{binaryTopicRegexp} || $tp !~ m/^$hash->{binaryTopicRegexp}$/) {
+      if(!$hash->{binaryTopicRegexp} || $tp !~ m/^$hash->{binaryTopicRegexp}$/){
         $val = Encode::decode('UTF-8', $val);
       }
     }
@@ -530,10 +531,10 @@ MQTT2_CLIENT_Read($@)
       my $ir = AttrVal($name, "ignoreRegexp", undef);
       if(!defined($ir) || "$tp:$val" !~ m/$ir/) {
         my $ac = AttrVal($name, "autocreate", "no");
-        $ac = $ac eq "1" ? "simple" : ($ac eq "0" ? "no" : $ac); # backward comp.
+        $ac = $ac eq "1" ? "simple" : ($ac eq "0" ? "no" : $ac); #backward comp.
 
         my $cid = makeDeviceName($hash->{clientId});
-        $tp =~ s/:/_/g; # 96608
+        $tp =~ s/:/_/g if(AttrVal($name, "topicConversion", 1)); # 96608
         Dispatch($hash, "autocreate=$ac\0$cid\0$tp\0$val", undef, $ac eq "no");
 
         my $re = AttrVal($name, "rawEvents", undef);
@@ -942,6 +943,13 @@ MQTT2_CLIENT_feedTheList($$$)
       possible options documented in perldoc IO::Socket::SSL
       </li><br>
 
+    <a id="MQTT2_CLIENT-attr-topicConversion"></a>
+    <li>topicConversion [1|0]<br>
+      due to historic reasons colon (:) is converted in the topic to underscore
+      (_). Setting this attribute to 0 will disable this conversion.  Default
+      is 1.
+      </li><br>
+
     <a id="MQTT2_CLIENT-attr-username"></a>
     <li>username &lt;username&gt;<br>
       set the username. The password is set via the set command, and is stored
diff --git a/fhem/FHEM/00_MQTT2_SERVER.pm b/fhem/FHEM/00_MQTT2_SERVER.pm
index 91ce71756..bd15fcc03 100644
--- a/fhem/FHEM/00_MQTT2_SERVER.pm
+++ b/fhem/FHEM/00_MQTT2_SERVER.pm
@@ -49,6 +49,7 @@ MQTT2_SERVER_Initialize($)
     rawEvents
     sslVersion
     sslCertPrefix
+    topicConversion:0,1
   );
   use warnings 'qw';
   $hash->{AttrList} = join(" ", @attrList)." ".$readingFnAttributes;
@@ -540,8 +541,8 @@ MQTT2_SERVER_doPublish($$$$;$)
     # Save it
     my %nots = map { $_ => $server->{retain}{$_}{val} }
                keys %{$server->{retain}};
-    my $rname = AttrVal($server->{NAME}, "hideRetain", 0) ? ".RETAIN" : "RETAIN";
-    setReadingsVal($server, $rname, toJSON(\%nots), FmtDateTime(gettimeofday()));
+    my $rname = AttrVal($server->{NAME}, "hideRetain", 0) ? ".RETAIN":"RETAIN";
+    setReadingsVal($server, $rname, toJSON(\%nots),FmtDateTime(gettimeofday()));
   }
 
   foreach my $clName (keys %{$server->{clients}}) {
@@ -553,7 +554,7 @@ MQTT2_SERVER_doPublish($$$$;$)
   return if(defined($ir) && "$tp:$val" =~ m/$ir/);
 
   my $cid = $src->{cid};
-  $tp =~ s/:/_/g; # 96608
+  $tp =~ s/:/_/g if(AttrVal($serverName, "topicConversion", 1)); # 96608
   if(defined($cid) ||                    # "real" MQTT client
      AttrVal($serverName, "rePublish", undef)) {
     $cid = $src->{NAME} if(!defined($cid));
@@ -900,6 +901,13 @@ MQTT2_SERVER_ReadDebug($$)
        also the SSL attribute.
        </li><br>
 
+    <a id="MQTT2_SERVER-attr-topicConversion"></a>
+    <li>topicConversion [1|0]<br>
+      due to historic reasons colon (:) is converted in the topic to underscore
+      (_). Setting this attribute to 0 will disable this conversion.  Default
+      is 1.
+      </li><br>
+
   </ul>
 </ul>
 =end html