diff --git a/FHEM/72_FB_CALLMONITOR.pm b/FHEM/72_FB_CALLMONITOR.pm
index 304b3d755..f7ccb46b5 100755
--- a/FHEM/72_FB_CALLMONITOR.pm
+++ b/FHEM/72_FB_CALLMONITOR.pm
@@ -230,7 +230,7 @@ FB_CALLMONITOR_Read($)
    }
 
    # Remove trailing hash sign and everything afterwards
-   $external_number =~ s/#.*$// if(defined($external_number);
+   $external_number =~ s/#.*$// if(defined($external_number));
   
    $reverse_search = FB_CALLMONITOR_reverseSearch($hash, $external_number) if(defined($external_number) and AttrVal($name, "reverse-search", "none") ne "none");