diff --git a/lib/public/activity/iextension.php b/lib/public/activity/iextension.php
index 1b405ad8d3d24891a105c4d936a09b6323882ded..6f30f4eb9c2d3a1fde75efc2138153e2017fac7d 100644
--- a/lib/public/activity/iextension.php
+++ b/lib/public/activity/iextension.php
@@ -90,7 +90,7 @@ interface IExtension {
 	 * @param string $text
 	 * @return array|false
 	 */
-	function getSpecialParameterList($app, $text);
+	public function getSpecialParameterList($app, $text);
 
 	/**
 	 * A string naming the css class for the icon to be used can be returned.