diff --git a/bin/tests/system/isctest/kasp.py b/bin/tests/system/isctest/kasp.py
index a2bc24d926..2160ce1e0d 100644
--- a/bin/tests/system/isctest/kasp.py
+++ b/bin/tests/system/isctest/kasp.py
@@ -26,12 +26,7 @@ import isctest.log
 DEFAULT_TTL = 300
 
 
-def _save_response(response, fname):
-    with open(fname, "w", encoding="utf-8") as file:
-        file.write(response.to_text())
-
-
-def _query(server, qname, qtype, outfile=None):
+def _query(server, qname, qtype):
     query = dns.message.make_query(qname, qtype, use_edns=True, want_dnssec=True)
     try:
         response = dns.query.tcp(query, server.ip, port=server.ports.dns, timeout=3)
@@ -39,9 +34,6 @@ def _query(server, qname, qtype, outfile=None):
         isctest.log.debug(f"query timeout for query {qname} {qtype} to {server.ip}")
         return None
 
-    if outfile is not None:
-        _save_response(response, outfile)
-
     return response