diff --git a/sources/application/UI/Base/Component/Panel/Panel.php b/sources/application/UI/Base/Component/Panel/Panel.php
index 1b130b1d8..c67a231b1 100644
--- a/sources/application/UI/Base/Component/Panel/Panel.php
+++ b/sources/application/UI/Base/Component/Panel/Panel.php
@@ -432,7 +432,7 @@ class Panel extends UIContentBlock
 	/**
 	 * @return bool
 	 */
-	public function isIsCollapsible(): bool
+	public function IsCollapsible(): bool
 	{
 		return $this->bIsCollapsible;
 	}