diff --git a/sio/csvio/writer.go b/sio/csvio/writer.go
index e19e32f221..617d38f74d 100644
--- a/sio/csvio/writer.go
+++ b/sio/csvio/writer.go
@@ -93,19 +93,17 @@ func (w *Writer) Write(rec super.Value) error {
 	for i, it := 0, rec.Bytes().Iter(); i < len(fields) && !it.Done(); i++ {
 		var s string
 		elem := it.Next()
-		if !super.IsNone(fields[i].Type, elem) {
-			val := super.NewValue(fields[i].Type, elem).Under()
-			switch id := val.Type().ID(); {
-			case id == super.IDBytes && len(val.Bytes()) == 0:
-				// We want "" instead of "0x" for a zero-length value.
-			case id == super.IDString:
-				s = string(val.Bytes())
-			case id == super.IDNull:
-			default:
-				s = formatValue(val.Type(), val.Bytes())
-				if super.IsFloat(id) && strings.HasSuffix(s, ".") {
-					s = strings.TrimSuffix(s, ".")
-				}
+		val := super.NewValue(fields[i].Type, elem).Under()
+		switch id := val.Type().ID(); {
+		case id == super.IDBytes && len(val.Bytes()) == 0:
+			// We want "" instead of "0x" for a zero-length value.
+		case id == super.IDString:
+			s = string(val.Bytes())
+		case id == super.IDNull || id == super.IDNone:
+		default:
+			s = formatValue(val.Type(), val.Bytes())
+			if super.IsFloat(id) && strings.HasSuffix(s, ".") {
+				s = strings.TrimSuffix(s, ".")
 			}
 		}
 		w.strings = append(w.strings, s)
diff --git a/sio/csvio/ztests/none.yaml b/sio/csvio/ztests/none.yaml
new file mode 100644
index 0000000000..f2569b60e6
--- /dev/null
+++ b/sio/csvio/ztests/none.yaml
@@ -0,0 +1,9 @@
+spq: pass
+
+flags: -f csv
+
+input: |
+  {a:none::(int64|none)}
+
+output: "a\n\
+  \n"