diff --git a/fhem/FHEM/72_FB_CALLMONITOR.pm b/fhem/FHEM/72_FB_CALLMONITOR.pm
index 46111a3ef..97c1eab91 100755
--- a/fhem/FHEM/72_FB_CALLMONITOR.pm
+++ b/fhem/FHEM/72_FB_CALLMONITOR.pm
@@ -762,7 +762,7 @@ sub FB_CALLMONITOR_html2txt($)
     $string =~ s/(\xd6|Ö|\\u00d6|\\u00D6)/Ö/g;
     $string =~ s/(\xfc|ü|\\u00fc|\\u00FC)/ü/g;
     $string =~ s/(\xdc|Ü|\\u00dc|\\u00DC)/Ü/g;
-    $string =~ s/(\xdf|ß)/ß/g;
+    $string =~ s/(\xdf|ß|\\u00df|\\u00DF)/ß/g;
     $string =~ s/<[^>]+>//g;
     $string =~ s/&lt;/</g;
     $string =~ s/&gt;/>/g;