diff --git a/modules/node/node.module b/modules/node/node.module
index a3e0f20face9..9c0b3d38184b 100644
--- a/modules/node/node.module
+++ b/modules/node/node.module
@@ -1257,12 +1257,22 @@ function node_search($op = 'search', $keys = NULL) {
         $join2 .= ' LEFT JOIN {node_counter} nc ON nc.nid = i.sid';
         $total += $weight;
       }
-      $select2 = (count($ranking) ? implode(' + ', $ranking) : 'i.relevance') .' AS score';
-
-      // Do search
+      
+      // When all search factors are disabled (ie they have a weight of zero), 
+      // the default score is based only on keyword relevance and there is no need to 
+      // adjust the score of each item. 
+      if ($total == 0) {
+        $select2 = 'i.relevance AS score';
+        $total = 1;
+      }
+      else {
+        $select2 = implode(' + ', $ranking) . ' AS score';
+      }
+      
+      // Do search.
       $find = do_search($keys, 'node', 'INNER JOIN {node} n ON n.nid = i.sid '. $join1 .' INNER JOIN {users} u ON n.uid = u.uid', $conditions1 . (empty($where1) ? '' : ' AND '. $where1), $arguments1, $select2, $join2, $arguments2);
 
-      // Load results
+      // Load results.
       $results = array();
       foreach ($find as $item) {
         // Build the node body.
@@ -1271,9 +1281,9 @@ function node_search($op = 'search', $keys = NULL) {
         $node = node_build_content($node, FALSE, FALSE);
         $node->body = drupal_render($node->content);
 
-        // Fetch comments for snippet
+        // Fetch comments for snippet.
         $node->body .= module_invoke('comment', 'nodeapi', $node, 'update index');
-        // Fetch terms for snippet
+        // Fetch terms for snippet.
         $node->body .= module_invoke('taxonomy', 'nodeapi', $node, 'update index');
 
         $extra = node_invoke_nodeapi($node, 'search result');