diff --git a/internal/querylog/csv.go b/internal/querylog/csv.go
index d985a0ac..ccd026ce 100644
--- a/internal/querylog/csv.go
+++ b/internal/querylog/csv.go
@@ -9,9 +9,11 @@ import (
 	"github.com/miekg/dns"
 )
 
+// csvRow is an alias type for csv rows.
+type csvRow = [18]string
+
 // csvHeaderRow is a slice of strings with column names for CSV header row.
-// This slice should correspond with [logEntry.toCSV] func.
-var csvHeaderRow = []string{
+var csvHeaderRow = csvRow{
 	"ans_dnssec",
 	"ans_rcode",
 	"ans_type",
@@ -34,7 +36,7 @@ var csvHeaderRow = []string{
 
 // toCSV returns a slice of strings with entry fields according to the
 // csvHeaderRow slice.
-func (e *logEntry) toCSV() (out []string) {
+func (e *logEntry) toCSV() (out csvRow) {
 	var filterID, filterRule string
 
 	if e.Result.IsFiltered && len(e.Result.Rules) > 0 {
@@ -45,7 +47,7 @@ func (e *logEntry) toCSV() (out []string) {
 
 	aData := ansData(e)
 
-	return []string{
+	return csvRow{
 		strconv.FormatBool(e.AuthenticatedData),
 		aData.rCode,
 		aData.typ,
diff --git a/internal/querylog/http.go b/internal/querylog/http.go
index e3d9a19a..0c2172f8 100644
--- a/internal/querylog/http.go
+++ b/internal/querylog/http.go
@@ -125,7 +125,7 @@ func (l *queryLog) handleQueryLogExport(w http.ResponseWriter, r *http.Request)
 	csvWriter := csv.NewWriter(w)
 
 	// Write header.
-	if err = csvWriter.Write(csvHeaderRow); err != nil {
+	if err = csvWriter.Write(csvHeaderRow[:]); err != nil {
 		http.Error(w, "writing csv header", http.StatusInternalServerError)
 
 		return
@@ -148,7 +148,8 @@ func (l *queryLog) handleQueryLogExport(w http.ResponseWriter, r *http.Request)
 		params.offset += params.limit
 
 		for _, entry := range entries {
-			if err = csvWriter.Write(entry.toCSV()); err != nil {
+			row := entry.toCSV()
+			if err = csvWriter.Write(row[:]); err != nil {
 				// TODO(a.garipov): Set Trailer X-Error header.
 				log.Error("%s %s %s: %s", r.Method, r.Host, r.URL, "writing csv record")