diff --git a/pg4wp/driver_pgsql.php b/pg4wp/driver_pgsql.php
index dc1cadc..a70e398 100644
--- a/pg4wp/driver_pgsql.php
+++ b/pg4wp/driver_pgsql.php
@@ -153,7 +153,7 @@
 			$sql = preg_replace( $pattern, '($1 + $2)', $sql);
 			
 			// UNIX_TIMESTAMP in MYSQL returns an integer
-			$pattern = '/UNIX_TIMESTAMP\(([^\)])\)/';
+			$pattern = '/UNIX_TIMESTAMP\(([^\)]+)\)/';
 			$sql = preg_replace( $pattern, 'ROUND(DATE_PART(\'epoch\',$1))', $sql);
 			
 			$date_funcs = array(