diff --git a/includes/classes/class_date.php b/includes/classes/class_date.php
index 5368d8c68dc..766f5780935 100644
--- a/includes/classes/class_date.php
+++ b/includes/classes/class_date.php
@@ -1142,7 +1142,7 @@ static function NUM_TO_MONTH_INSTRUMENTAL($n, $leap_year) {
 	}
 	static function NUM_TO_SHORT_MONTH($n, $leap_year) {
 		// TODO: Do these have short names?
-		return $this->NUM_TO_MONTH_NOMINATIVE($n);
+		return self::NUM_TO_MONTH_NOMINATIVE($n, $leap_year);
 	}
 	static function NUM_TO_GEDCOM_MONTH($n, $leap_year) {
 		switch ($n) {