diff --git a/boost.module b/boost.module
index 4e9e3c9..626a63c 100644
--- a/boost.module
+++ b/boost.module
@@ -6255,29 +6255,15 @@ function boost_crawler_add_alias_to_table() {
  *  Has the site changed, if so get expire column
  */
 function boost_crawler_prune_table($expire) {
-  global $db_type;
-
   if (variable_get('boost_crawl_prune_table', FALSE)) {
     return TRUE;
   }
 
-  // PostgreSQL
-  if (stristr($db_type, 'pgsql')) {
-    if ($expire && BOOST_LOOPBACK_BYPASS) {
-      db_query("DELETE cr FROM {boost_crawler} cr USING {boost_cache} AS ca WHERE cr.hash=ca.hash_url AND ca.expire BETWEEN 1 AND 434966399 OR ca.expire > %d", BOOST_TIME);
-    }
-    else {
-      db_query("DELETE cr FROM {boost_crawler} cr USING {boost_cache} AS ca WHERE cr.hash=ca.hash_url AND ca.expire BETWEEN 1 AND 434966399 OR ca.expire > 434966400");
-    }
+  if ($expire && BOOST_LOOPBACK_BYPASS) {
+    db_query("DELETE FROM {boost_crawler} cr WHERE cr.hash IN (SELECT ca.hash_url FROM {boost_cache} ca WHERE ca.expire BETWEEN 1 AND 434966399 OR ca.expire > %d)", BOOST_TIME);
   }
-  // All others
   else {
-    if ($expire && BOOST_LOOPBACK_BYPASS) {
-      db_query("DELETE cr FROM {boost_crawler} cr INNER JOIN {boost_cache} AS ca ON cr.hash=ca.hash_url WHERE ca.expire BETWEEN 1 AND 434966399 OR ca.expire > %d", BOOST_TIME);
-    }
-    else {
-      db_query("DELETE cr FROM {boost_crawler} cr INNER JOIN {boost_cache} AS ca ON cr.hash=ca.hash_url WHERE ca.expire BETWEEN 1 AND 434966399 OR ca.expire > 434966400");
-    }
+    db_query("DELETE FROM {boost_crawler} cr WHERE cr.hash IN (SELECT ca.hash_url FROM {boost_cache} ca WHERE ca.expire BETWEEN 1 AND 434966399 OR ca.expire > 434966400)");
   }
 
   variable_set('boost_crawl_prune_table', TRUE);