diff --git a/pandora_console/install.php b/pandora_console/install.php
index b12d279235..c805d3f352 100644
--- a/pandora_console/install.php
+++ b/pandora_console/install.php
@@ -591,6 +591,7 @@ function install_step2() {
 			$res += check_extension("json","PHP json extension");
 			$res += check_extension("curl","CURL (Client URL Library)");
 			$res += check_extension("filter","PHP filter extension");
+			$res += check_extension("calendar","PHP calendar extension");
 			if (PHP_OS == "FreeBSD") {
 				$res += check_exists ("/usr/local/bin/twopi","Graphviz Binary");
 			}