diff --git a/pg4wp/driver_pgsql.php b/pg4wp/driver_pgsql.php
index 9189a6a..d427940 100644
--- a/pg4wp/driver_pgsql.php
+++ b/pg4wp/driver_pgsql.php
@@ -257,6 +257,8 @@
 		
 		// The following handles a new "INTERVAL" call in Akismet 2.2.7
 		$sql = str_replace('INTERVAL 15 DAY', "'15 days'::interval", $sql);
+		$pattern = '/DATE_SUB[ ]*\(([^,]+),([^\)]+)\)/';
+		$sql = preg_replace( $pattern, '($1::timestamp - $2)', $sql);
 		
 		// Field names with CAPITALS need special handling
 		if( false !== strpos($sql, 'ID'))
diff --git a/readme.txt b/readme.txt
index 7775b70..50a15a7 100644
--- a/readme.txt
+++ b/readme.txt
@@ -53,6 +53,7 @@ There is no screenshot for this plugin
 * Moved parts required only when installing/upgrading from driver_pgsql.php to a separate file
 	The file is loaded only when needed so that memory footprint should be a bit smaller
 * Added UNIX_TIMESTAMP support
+* Added DATE_SUB support for Akismet 2.2.7
 * Added DAYOFMONTH support (Thanks to Pete Deffendol for noticing the problem)
 * Upgrading from WP 2.8.6 to WP 2.9.1 works with a minor error
 	Upgrading should remove an index on table "wp_options" that may not exist, throwing an error