diff --git a/htdocs/core/class/lessc.class.php b/htdocs/core/class/lessc.class.php
index 0484968f526..5cfbfe2ed09 100644
--- a/htdocs/core/class/lessc.class.php
+++ b/htdocs/core/class/lessc.class.php
@@ -2281,7 +2281,7 @@ class Lessc
 	 *
 	 * @param mixed $in Input
 	 * @param bool $force Force rebuild?
-	 * @return array lessphp cache structure
+	 * @return array|null lessphp cache structure
 	 */
 	public function cachedCompile($in, $force = false)
 	{