diff --git a/fhem/FHEM/99_updatefhem.pm b/fhem/FHEM/99_updatefhem.pm
index 196497baf..731e2be3a 100644
--- a/fhem/FHEM/99_updatefhem.pm
+++ b/fhem/FHEM/99_updatefhem.pm
@@ -244,6 +244,7 @@ CommandUpdatefhem($$)
     return "File size for $f ($l1) does not correspond to ".
                 "filetimes.txt entry ($l2)" if($l1 ne $l2);
     open(FH,">$localfile") || return "Can't write $localfile";
+    binmode(FH);
     print FH $content;
     close(FH);
     $ret .= "updated $f\n";