diff --git a/src/js/account/sync.js b/src/js/account/sync.js
index ba200c5..cc01c10 100644
--- a/src/js/account/sync.js
+++ b/src/js/account/sync.js
@@ -174,10 +174,11 @@ export function syncWords(remoteWords, deletedWords) {
   }
   
   remoteWords.forEach(remoteWord => {
-    let localWord = words.find(word => word.wordId === remoteWord.wordId);
+    const localWordIndex = words.findIndex(word => word.wordId === remoteWord.wordId);
+    const localWord = words[localWordIndex];
     if (localWord) {
       if (localWord.lastUpdated < remoteWord.lastUpdated) {
-        localWord = remoteWord;
+        words[localWordIndex] = remoteWord;
       } else if (localWord.lastUpdated > remoteWord.lastUpdated) {
         // Add more-recently-updated words to upload
         localWordsToUpload.push(localWord);
diff --git a/src/php/api/Dictionary.php b/src/php/api/Dictionary.php
index 02cfc73..95ecea7 100644
--- a/src/php/api/Dictionary.php
+++ b/src/php/api/Dictionary.php
@@ -258,7 +258,7 @@ WHERE dictionary=$dictionary";
     $word_ids = array();
     $most_recent_word_update = 0;
     foreach($words as $word) {
-      $last_updated = isset($word['lastUpdated']) ? $word['createdOn'] : $word['lastUpdated'];
+      $last_updated = isset($word['lastUpdated']) ? $word['lastUpdated'] : $word['createdOn'];
       if ($most_recent_word_update < $last_updated) {
         $most_recent_word_update = $last_updated;
       }