diff --git a/update-dns.sh b/update-dns.sh
index 387732b..9c856fd 100644
--- a/update-dns.sh
+++ b/update-dns.sh
@@ -150,7 +150,7 @@ if [ -n "$ServeMasterZone" ] || [ -n "$ServeExtZone" ]; then
 		[ -n "$(sed -e '/^\s*\(@\s\+\([0-9]*\s\)\?\s*[Ii][Nn]\s\+[Nn][Ss]\)\s/!d' "$CachedMasterFile""E")" ] || \
 			sed -i -e 's/^\s*\(@\s\+\([0-9]*\s\)\?\s*[Ii][Nn]\s\+[Ss][Oo][Aa]\)\s\+\S\+\s\+\S\+\s/\1 '"$DNSSCRIPT_SERVER_NAME"'. '"$DNSSCRIPT_CONTACT_EMAIL"' /g' "$CachedMasterFile""E"
 		
-		sed -i -e 's/^\s*'"$CommunityExternPrefix"'\s/@ /g' "$CachedMasterFile""E"
+		sed -i -e 's/^\s*'"$CommunityExternPrefix"'\s/@ /g;/^\s*@\s\+[Ii][Nn]\s\+[Dd][Ss]\s/d' "$CachedMasterFile""E"
 		
 		UpdateExternDomain="$(UpdateDNSSECEntryCache "$CommunityExternDomain" "$ZoneTempFolder" "$CachedMasterFile""E" "$DNSSECKeyFolder")"
 		if [ $UpdateExternView -ne 0 ] || [ $UpdateExternDomain -ne 0 ]; then