diff --git a/src/Forms/Container.php b/src/Forms/Container.php
index e7c3a9417..7fa47ab7c 100644
--- a/src/Forms/Container.php
+++ b/src/Forms/Container.php
@@ -36,7 +36,7 @@ class Container extends Nette\ComponentModel\Container implements \ArrayAccess
 	public array $onValidate = [];
 	protected ?ControlGroup $currentGroup = null;
 
-	/** @var array<string, callable(static): mixed> */
+	/** @var array<string, callable(static, never, never, never, never, never, never, never, never, never): mixed> */
 	private static array $extMethods = [];
 	private ?bool $validated = false;
 	private ?string $mappedType = null;
@@ -626,6 +626,7 @@ public function addContainer(string|int $name): self
 	public function __call(string $name, array $args)
 	{
 		if (isset(self::$extMethods[$name])) {
+			/** @var never[] $args */
 			return (self::$extMethods[$name])($this, ...$args);
 		}
 
@@ -633,7 +634,7 @@ public function __call(string $name, array $args)
 	}
 
 
-	/** @param callable(static): mixed  $callback */
+	/** @param callable(static, never, never, never, never, never, never, never, never, never): mixed  $callback */
 	public static function extensionMethod(string $name, callable $callback): void
 	{
 		if (str_contains($name, '::')) { // back compatibility
diff --git a/src/Forms/Controls/BaseControl.php b/src/Forms/Controls/BaseControl.php
index fa616e509..61608f55a 100644
--- a/src/Forms/Controls/BaseControl.php
+++ b/src/Forms/Controls/BaseControl.php
@@ -50,7 +50,7 @@ abstract class BaseControl extends Nette\ComponentModel\Component implements Con
 	/** @var bool|bool[] */
 	protected bool|array $disabled = false;
 
-	/** @var array<string, array<class-string, callable(static): mixed>> */
+	/** @var array<string, array<class-string, callable(static, never, never, never, never, never, never, never, never, never): mixed>> */
 	private static array $extMethods = [];
 	private string|Stringable|null $caption;
 
@@ -566,6 +566,7 @@ public function __call(string $name, array $args)
 		$class = static::class;
 		do {
 			if (isset(self::$extMethods[$name][$class])) {
+				/** @var never[] $args */
 				return (self::$extMethods[$name][$class])($this, ...$args);
 			}
 
@@ -576,7 +577,7 @@ public function __call(string $name, array $args)
 	}
 
 
-	/** @param callable(static): mixed  $callback */
+	/** @param callable(static, never, never, never, never, never, never, never, never, never): mixed  $callback */
 	public static function extensionMethod(string $name, callable $callback): void
 	{
 		if (str_contains($name, '::')) { // back compatibility