diff --git a/FHEM/01_FHEMWEB.pm b/FHEM/01_FHEMWEB.pm
index 54e6ff98b..6795a11c4 100644
--- a/FHEM/01_FHEMWEB.pm
+++ b/FHEM/01_FHEMWEB.pm
@@ -3196,7 +3196,7 @@ FW_devState($$@)
     $cmdList = "desiredTemperature" if(!$cmdList);
 
   } else {
-    my $html;
+    my $html = "";
     foreach my $state (split("\n", $state)) {
       $txt = $state;
       my ($icon, $isHtml);