diff --git a/src/Nella/Forms/DateTime/DateInput.php b/src/Nella/Forms/DateTime/DateInput.php
index 6bb5b08..89caf87 100644
--- a/src/Nella/Forms/DateTime/DateInput.php
+++ b/src/Nella/Forms/DateTime/DateInput.php
@@ -148,10 +148,9 @@ public function isFilled()
 	}
 
 	/**
-	 * @param \Nella\Forms\DateTime\DateInput $control
 	 * @return bool
 	 */
-	public function validateDate(DateInput $control)
+	public function validateDate()
 	{
 		return $this->isDisabled() || !$this->isFilled() || $this->getValue() !== NULL;
 	}