diff --git a/dnsapi/dns_ispconfig.sh b/dnsapi/dns_ispconfig.sh
index 1e500ad..2d8d6b0 100755
--- a/dnsapi/dns_ispconfig.sh
+++ b/dnsapi/dns_ispconfig.sh
@@ -128,7 +128,7 @@ _ISPC_addTxt() {
   curSerial="$(date +%s)"
   curStamp="$(date +'%F %T')"
   params="\"server_id\":\"${server_id}\",\"zone\":\"${zone}\",\"name\":\"${fulldomain}.\",\"type\":\"txt\",\"data\":\"${txtvalue}\",\"aux\":\"0\",\"ttl\":\"3600\",\"active\":\"y\",\"stamp\":\"${curStamp}\",\"serial\":\"${curSerial}\""
-  curData="{\"session_id\":\"${sessionID}\",\"client_id\":\"${client_id}\",\"params\":{${params}}}"
+  curData="{\"session_id\":\"${sessionID}\",\"client_id\":\"${client_id}\",\"params\":{${params}},\"update_serial\":true}"
   curResult="$(_post "${curData}" "${ISPC_Api}?dns_txt_add")"
   _debug "Calling _ISPC_addTxt: '${curData}' '${ISPC_Api}?dns_txt_add'"
   _debug "Result of _ISPC_addTxt: '$curResult'"
@@ -160,7 +160,7 @@ _ISPC_rmTxt() {
       *)
         unset IFS
         _info "Retrieved Record ID."
-        curData="{\"session_id\":\"${sessionID}\",\"primary_id\":\"${record_id}\"}"
+        curData="{\"session_id\":\"${sessionID}\",\"primary_id\":\"${record_id}\",\"update_serial\":true}"
         curResult="$(_post "${curData}" "${ISPC_Api}?dns_txt_delete")"
         _debug "Calling _ISPC_rmTxt: '${curData}' '${ISPC_Api}?dns_txt_delete'"
         _debug "Result of _ISPC_rmTxt: '$curResult'"