diff --git a/filter/DNBXmlFilter.inc.php b/filter/DNBXmlFilter.inc.php
index 68e7c90..60df2fc 100644
--- a/filter/DNBXmlFilter.inc.php
+++ b/filter/DNBXmlFilter.inc.php
@@ -172,7 +172,7 @@ function &process(&$pubObject) {
 			$this->createSubfieldNode($doc, $datafield245, 'b', $subTitle);
 		}
 		// date published
-		$datafield264 = $this->createDatafieldNode($doc, $recordNode, '264', ' ', ' ');
+		$datafield264 = $this->createDatafieldNode($doc, $recordNode, '264', ' ', '1');
 		$this->createSubfieldNode($doc, $datafield264, 'c', $yearYYYY);
 		// article level URN and DOI (only if galley level URN and DOI do not exist)
 		if (empty($urn) && empty($doi)) {