diff --git a/fhem/FHEM/01_FHEMWEB.pm b/fhem/FHEM/01_FHEMWEB.pm
index 3a15ed065..bfdcbac69 100755
--- a/fhem/FHEM/01_FHEMWEB.pm
+++ b/fhem/FHEM/01_FHEMWEB.pm
@@ -464,6 +464,7 @@ FW_Read($$)
      ($FW_httpheader{"Accept-Encoding"} &&
       $FW_httpheader{"Accept-Encoding"} =~ m/gzip/) &&
      $FW_use_zlib) {
+    utf8::encode($FW_RET) if(utf8::is_utf8($FW_RET));
     eval { $FW_RET = Compress::Zlib::memGzip($FW_RET); };
     if($@) {
       Log 1, "memGzip: $@"; $FW_RET=""; #Forum #29939
diff --git a/fhem/FHEM/98_telnet.pm b/fhem/FHEM/98_telnet.pm
index 30660a326..1a4388f87 100644
--- a/fhem/FHEM/98_telnet.pm
+++ b/fhem/FHEM/98_telnet.pm
@@ -316,6 +316,7 @@ telnet_Output($$$)
       $ret = "$ret\n"                   if(!$hash->{showPrompt});
     }
     for(;;) {
+      utf8::encode($ret) if(utf8::is_utf8($ret));
       my $l = syswrite($hash->{CD}, $ret);
       last if(!$l || $l == length($ret));
       $ret = substr($ret, $l);