diff --git a/piqt_utils/piqt_iodevice_edit_dialog.cpp b/piqt_utils/piqt_iodevice_edit_dialog.cpp
index e004ab0..5380c1d 100644
--- a/piqt_utils/piqt_iodevice_edit_dialog.cpp
+++ b/piqt_utils/piqt_iodevice_edit_dialog.cpp
@@ -91,7 +91,16 @@ QAD::IODevice IODeviceEditDialog::value() const {
 
 
 void IODeviceEditDialog::setValue(const QAD::IODevice & d) {
+#if QT_VERSION >= 0x050000
 	ui->comboType->setCurrentText(d.prefix);
+#else
+	for (int i = 0; i < ui->comboType->count(); ++i) {
+		if (ui->comboType->itemText(i) == d.prefix) {
+			ui->comboType->setCurrentIndex(i);
+			break;
+		}
+	}
+#endif
 	for (int i = 0; i < ui->comboMode->count(); ++i)
 		if (ui->comboMode->itemData(i).toInt() == d.mode) {
 			ui->comboMode->setCurrentIndex(i);