diff --git a/code/Calendar.php b/code/Calendar.php
index 8b762c9..0f992a9 100755
--- a/code/Calendar.php
+++ b/code/Calendar.php
@@ -240,7 +240,7 @@ protected function getStandardEvents($start, $end, $filter = null) {
 				(EndDate BETWEEN '$start' AND '$end')
 		");
 		$list->filter(array($relation => $ids));
-		$list->innerJoin($event_class, $relation = "\"{$event_class}\".ID");
+		$list->innerJoin($event_class, "$relation = \"{$event_class}\".ID");
 		return $list;
 	}