diff --git a/src/Bridges/FormsLatte/FormMacros.php b/src/Bridges/FormsLatte/FormMacros.php
index 07bba735c..173e06760 100644
--- a/src/Bridges/FormsLatte/FormMacros.php
+++ b/src/Bridges/FormsLatte/FormMacros.php
@@ -140,9 +140,9 @@ public function macroInput(MacroNode $node, PhpWriter $writer)
 		$node->replaced = true;
 		$name = array_shift($words);
 		return $writer->write(
-			($name[0] === '$' ? '$_input = is_object(%0.word) ? %0.word : end($this->global->formsStack)[%0.word]; echo $_input' : 'echo end($this->global->formsStack)[%0.word]')
-				. '->%1.raw'
-				. ($node->tokenizer->isNext() ? '->addAttributes(%node.array)' : '')
+			($name[0] === '$' ? '$_input = is_object(%0.word) ? %0.word : end($this->global->formsStack)[%0.word]; ' : 'echo end($this->global->formsStack)[%0.word]; ')
+				. ($node->tokenizer->isNext() ? 'foreach(%node.array as $_k => $_v) {$_input->setHtmlAttribute($_k, $_v);} ' : '')
+				. 'echo $_input->%1.raw'
 				. " /* line $node->startLine */",
 			$name,
 			$words ? 'getControlPart(' . implode(', ', array_map([$writer, 'formatWord'], $words)) . ')' : 'getControl()'
diff --git a/src/Forms/Controls/SelectBox.php b/src/Forms/Controls/SelectBox.php
index ebcdfb1c0..4b80a3fdd 100644
--- a/src/Forms/Controls/SelectBox.php
+++ b/src/Forms/Controls/SelectBox.php
@@ -26,6 +26,9 @@ class SelectBox extends ChoiceControl
 	/** @var mixed */
 	private $prompt = false;
 
+	/** @var bool */
+	private $autoDefault = false;
+
 	/** @var array */
 	private $optionAttributes = [];
 
@@ -47,6 +50,7 @@ public function __construct($label = null, array $items = null)
 	public function setPrompt($prompt)
 	{
 		$this->prompt = $prompt;
+		$this->setDefaultValueAuto(null, true);
 		return $this;
 	}
 
@@ -61,6 +65,13 @@ public function getPrompt()
 	}
 
 
+	public function setDefaultValue($value)
+	{
+		$this->autoDefault = true;
+		return parent::setDefaultValue($value);
+	}
+
+
 	/**
 	 * Sets options and option groups from which to choose.
 	 * @return static
@@ -82,7 +93,13 @@ public function setItems(array $items, bool $useKeys = true)
 			$items = $res;
 		}
 		$this->options = $items;
-		return parent::setItems(Nette\Utils\Arrays::flatten($items, true));
+		parent::setItems(Nette\Utils\Arrays::flatten($items, true));
+
+		if ($this->prompt === false && $this->items) {
+			reset($this->items);
+			$this->setDefaultValueAuto(key($this->items));
+		}
+		return $this;
 	}
 
 
@@ -106,6 +123,15 @@ public function getControl(): Nette\Utils\Html
 	}
 
 
+	public function setHtmlAttribute(string $name, $value = true)
+	{
+		if ($name === 'size' && $value > 1) {
+			$this->setDefaultValueAuto(null, true);
+		}
+		return parent::setHtmlAttribute($name, $value);
+	}
+
+
 	/**
 	 * @return static
 	 */
@@ -124,4 +150,14 @@ public function isOk(): bool
 			|| !$this->options
 			|| $this->control->size > 1;
 	}
+
+
+	private function setDefaultValueAuto($value, bool $autoDefault = false)
+	{
+		if ($this->autoDefault === false) {
+			$this->setDefaultValue($value);
+			$this->autoDefault = $autoDefault;
+		}
+		return $this;
+	}
 }
diff --git a/tests/Forms.Latte/expected/FormMacros.forms.html b/tests/Forms.Latte/expected/FormMacros.forms.html
index 0557fa5ed..746d2e3bd 100644
--- a/tests/Forms.Latte/expected/FormMacros.forms.html
+++ b/tests/Forms.Latte/expected/FormMacros.forms.html
@@ -108,12 +108,12 @@
 </FORM>
 
 
-<select name="select" id="frm-select"><option value="m">male</option><option value="f">female</option></select>
+<select name="select" id="frm-select"><option value="m" selected>male</option><option value="f">female</option></select>
 
 
 <textarea title="10" name="area" id="frm-area">one&lt;two</textarea>
 
 
-<select name="select" id="frm-select"><option value="m">male</option><option value="f">female</option></select>
+<select name="select" id="frm-select"><option value="m" selected>male</option><option value="f">female</option></select>
 <!--[if IE]><input type=IEbug disabled style="display:none"><![endif]-->
 </form>
diff --git a/tests/Forms/Controls.SelectBox.defaultValue.phpt b/tests/Forms/Controls.SelectBox.defaultValue.phpt
new file mode 100644
index 000000000..1832ebbbc
--- /dev/null
+++ b/tests/Forms/Controls.SelectBox.defaultValue.phpt
@@ -0,0 +1,47 @@
+<?php
+
+/**
+ * Test: Nette\Forms\Controls\SelectBox::setDefaultValueAuto()
+ */
+
+declare(strict_types=1);
+
+use Nette\Forms\Form;
+use Tester\Assert;
+
+
+require __DIR__ . '/../bootstrap.php';
+
+
+$form = new Form;
+$select = $form->addSelect('foo', null, ['bar' => 'Bar', 'foo' => 'Foo']);
+Assert::same('bar', $select->getValue());
+
+$select->setPrompt('Baz');
+Assert::null($select->getValue());
+
+$select->setDefaultValue('foo');
+Assert::same('foo', $select->getValue());
+
+
+$form = new Form;
+$select = $form->addSelect('foo')
+	->setPrompt('Baz')
+	->setItems(['bar' => 'Bar', 'foo' => 'Foo']);
+Assert::null($select->getValue());
+
+
+$form = new Form;
+$select = $form->addSelect('foo')
+	->setItems(['bar' => 'Bar', 'foo' => 'Foo'])
+	->setDefaultValue('foo')
+	->setPrompt('Baz');
+Assert::same('foo', $select->getValue());
+
+
+$form = new Form;
+$select = $form->addSelect('foo')
+	->setPrompt('Baz')
+	->setItems(['bar' => 'Bar', 'foo' => 'Foo'])
+	->setDefaultValue('foo');
+Assert::same('foo', $select->getValue());
diff --git a/tests/Forms/Controls.SelectBox.isOk.phpt b/tests/Forms/Controls.SelectBox.isOk.phpt
index 094c69368..ebdc274b1 100644
--- a/tests/Forms/Controls.SelectBox.isOk.phpt
+++ b/tests/Forms/Controls.SelectBox.isOk.phpt
@@ -17,7 +17,7 @@ require __DIR__ . '/../bootstrap.php';
 $form = new Form;
 $select = $form->addSelect('foo', null, ['bar' => 'Bar']);
 
-Assert::false($select->isOk());
+Assert::true($select->isOk());
 
 $select->setDisabled(true);
 Assert::true($select->isOk());
diff --git a/tests/Forms/Controls.SelectBox.render.phpt b/tests/Forms/Controls.SelectBox.render.phpt
index 6c8a9e11e..86b542e32 100644
--- a/tests/Forms/Controls.SelectBox.render.phpt
+++ b/tests/Forms/Controls.SelectBox.render.phpt
@@ -35,7 +35,7 @@ test(function () {
 	Assert::same('<label for="frm-list">Another label</label>', (string) $input->getLabel('Another label'));
 
 	Assert::type(Html::class, $input->getControl());
-	Assert::same('<select name="list" id="frm-list"><option value="a">First</option><option value="0">Second</option></select>', (string) $input->getControl());
+	Assert::same('<select name="list" id="frm-list"><option value="a" selected>First</option><option value="0">Second</option></select>', (string) $input->getControl());
 });
 
 
@@ -96,7 +96,7 @@ test(function () { // validation rules
 		0 => 'Second',
 	])->setRequired('required');
 
-	Assert::same('<select name="list" id="frm-list" required data-nette-rules=\'[{"op":":filled","msg":"required"}]\'><option value="a">First</option><option value="0">Second</option></select>', (string) $input->getControl());
+	Assert::same('<select name="list" id="frm-list" required data-nette-rules=\'[{"op":":filled","msg":"required"}]\'><option value="a" selected>First</option><option value="0">Second</option></select>', (string) $input->getControl());
 });
 
 
@@ -108,7 +108,7 @@ test(function () { // container
 		0 => 'Second',
 	]);
 
-	Assert::same('<select name="container[list]" id="frm-container-list"><option value="a">First</option><option value="0">Second</option></select>', (string) $input->getControl());
+	Assert::same('<select name="container[list]" id="frm-container-list"><option value="a" selected>First</option><option value="0">Second</option></select>', (string) $input->getControl());
 });