diff --git a/src/Forms/Controls/SelectBox.php b/src/Forms/Controls/SelectBox.php
index 6f50e882..a13499a6 100644
--- a/src/Forms/Controls/SelectBox.php
+++ b/src/Forms/Controls/SelectBox.php
@@ -106,6 +106,7 @@ public function getControl(): Nette\Utils\Html
 			}
 			$items = [$promptKey => $this->translate($this->prompt)] + $items;
 			if ($this->isRequired()) {
+				$selected = array_key_exists($this->value, $this->getItems()) ? $this->value : null;
 				$attrs['hidden:'][$promptKey] = $attrs['disabled:'][$promptKey] = true;
 				$selected ??= $promptKey; // disabled & selected for Safari, hidden for other browsers
 			}
diff --git a/tests/Forms/Controls.SelectBox.render.phpt b/tests/Forms/Controls.SelectBox.render.phpt
index 83800c40..aac609eb 100644
--- a/tests/Forms/Controls.SelectBox.render.phpt
+++ b/tests/Forms/Controls.SelectBox.render.phpt
@@ -90,6 +90,33 @@ test('prompt + required', function () {
 	Assert::same('<select name="list" id="frm-list" required data-nette-rules=\'[{"op":":filled","msg":"This field is required."}]\'><option value="" disabled hidden>prompt</option><option value="a">First</option><option value="0" selected>Second</option></select>', (string) $input->getControl());
 });
 
+test('prompt + checkDefaultValueToFalse + value does not exist', function () {
+	$form = new Form;
+	$input = $form->addSelect('list', 'Label', [
+		'a' => 'First',
+		0 => 'Second',
+	])->setPrompt('prompt')->checkDefaultValue(false);
+
+	Assert::same('<select name="list" id="frm-list"><option value="">prompt</option><option value="a">First</option><option value="0">Second</option></select>', (string) $input->getControl());
+
+	$input->setValue('does not exists');
+
+	Assert::same('<select name="list" id="frm-list"><option value="">prompt</option><option value="a">First</option><option value="0">Second</option></select>', (string) $input->getControl());
+});
+
+test('prompt + required + checkDefaultValueToFalse + value does not exist', function () {
+	$form = new Form;
+	$input = $form->addSelect('list', 'Label', [
+		'a' => 'First',
+		0 => 'Second',
+	])->setPrompt('prompt')->setRequired()->checkDefaultValue(false);
+
+	Assert::same('<select name="list" id="frm-list" required data-nette-rules=\'[{"op":":filled","msg":"This field is required."}]\'><option value="" disabled hidden selected>prompt</option><option value="a">First</option><option value="0">Second</option></select>', (string) $input->getControl());
+
+	$input->setValue('does not exists');
+
+	Assert::same('<select name="list" id="frm-list" required data-nette-rules=\'[{"op":":filled","msg":"This field is required."}]\'><option value="" disabled hidden selected>prompt</option><option value="a">First</option><option value="0">Second</option></select>', (string) $input->getControl());
+});
 
 test('unique prompt', function () {
 	$form = new Form;