diff --git a/src/Field/CheckboxField.php b/src/Field/CheckboxField.php
index 14110296cb1f03405c8928913d9fd1a6ac1b4a00..101bc60099e2a2cb8c27d8adecbd4f8bc8f6025e 100644
--- a/src/Field/CheckboxField.php
+++ b/src/Field/CheckboxField.php
@@ -6,9 +6,6 @@ use WPDesk\Forms\Field;
 
 class CheckboxField extends BasicField {
 
-	const VALUE_TRUE  = 'yes';
-	const VALUE_FALSE = 'no';
-
 	public function get_type(): string {
 		return 'checkbox';
 	}
diff --git a/src/Field/DateField.php b/src/Field/DateField.php
index b5c11f7d84480906339b52595e4fd388c11d5ae5..58346dae1ed4b571bc1d050b63601fd3b39089fb 100644
--- a/src/Field/DateField.php
+++ b/src/Field/DateField.php
@@ -7,15 +7,14 @@ use WPDesk\Forms\Sanitizer\TextFieldSanitizer;
 class DateField extends BasicField {
 
 	public function __construct() {
-		parent::__construct();
 		$this->set_placeholder('YYYY-MM-DD');
 	}
 
-	public function get_type() {
+	public function get_type(): string {
 		return 'date';
 	}
 
-	public function get_template_name() {
+	public function get_template_name(): string {
 		return 'input-text';
 	}