diff --git a/CHANGELOG b/CHANGELOG
index 2e92e895..71b43358 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -34,6 +34,9 @@ v0.6.1 (2010-xx-xx)
     Backwards compatibility with previous releases of Predis is ensured. 
     The method Predis\Client::pipelineSafe() is to be considered deprecated.
 
+  * FIX: The WEIGHT modifier for ZUNIONSTORE and ZINTERSTORE was handled 
+    incorrectly with more than two weights specified.
+
 v0.6.0 (2010-05-24)
   * Switched to the new multi-bulk request protocol for all of the commands 
     in the Redis 1.2 and Redis 2.0 profiles. Inline and bulk requests are now 
diff --git a/lib/Predis.php b/lib/Predis.php
index 9f2fdcf1..05192104 100644
--- a/lib/Predis.php
+++ b/lib/Predis.php
@@ -2509,8 +2509,9 @@ class ZSetUnionStore extends \Predis\MultiBulkCommand {
         $finalizedOpts = array();
         if (isset($opts['WEIGHTS']) && is_array($opts['WEIGHTS'])) {
             $finalizedOpts[] = 'WEIGHTS';
-            $finalizedOpts[] = $opts['WEIGHTS'][0];
-            $finalizedOpts[] = $opts['WEIGHTS'][1];
+            foreach ($opts['WEIGHTS'] as $weight) {
+                $finalizedOpts[] = $weight;
+            }
         }
         if (isset($opts['AGGREGATE'])) {
             $finalizedOpts[] = 'AGGREGATE';