diff --git a/pg4wp/driver_pgsql.php b/pg4wp/driver_pgsql.php
index 43b67db..151035b 100644
--- a/pg4wp/driver_pgsql.php
+++ b/pg4wp/driver_pgsql.php
@@ -534,6 +534,10 @@
 		// WP 2.9.1 uses a comparison where text data is not quoted
 		$pattern = '/AND meta_value = (-?\d+)/';
 		$sql = preg_replace( $pattern, 'AND meta_value = \'$1\'', $sql);
+
+        // Add type cast for meta_value field when it's compared to number
+        $pattern = '/AND meta_value < (\d+)/';
+        $sql = preg_replace($pattern, 'AND meta_value::bigint < $1', $sql);
 		
 		// Generic "INTERVAL xx YEAR|MONTH|DAY|HOUR|MINUTE|SECOND" handler
 		$pattern = '/INTERVAL[ ]+(\d+)[ ]+(YEAR|MONTH|DAY|HOUR|MINUTE|SECOND)/';