diff --git a/src/applications/feed/query/PhabricatorFeedQuery.php b/src/applications/feed/query/PhabricatorFeedQuery.php
index 18a5d748d5..ce472a6026 100644
--- a/src/applications/feed/query/PhabricatorFeedQuery.php
+++ b/src/applications/feed/query/PhabricatorFeedQuery.php
@@ -1,165 +1,163 @@
 <?php
 
 final class PhabricatorFeedQuery
   extends PhabricatorCursorPagedPolicyAwareQuery {
 
   private $filterPHIDs;
   private $chronologicalKeys;
   private $rangeMin;
   private $rangeMax;
 
   public function withFilterPHIDs(array $phids) {
     $this->filterPHIDs = $phids;
     return $this;
   }
 
   public function withChronologicalKeys(array $keys) {
     $this->chronologicalKeys = $keys;
     return $this;
   }
 
   public function withEpochInRange($range_min, $range_max) {
     $this->rangeMin = $range_min;
     $this->rangeMax = $range_max;
     return $this;
   }
 
   public function newResultObject() {
     return new PhabricatorFeedStoryData();
   }
 
   protected function loadPage() {
     // NOTE: We return raw rows from this method, which is a little unusual.
     return $this->loadStandardPageRows($this->newResultObject());
   }
 
   protected function willFilterPage(array $data) {
     return PhabricatorFeedStory::loadAllFromRows($data, $this->getViewer());
   }
 
   protected function buildJoinClauseParts(AphrontDatabaseConnection $conn) {
     $joins = parent::buildJoinClauseParts($conn);
 
     // NOTE: We perform this join unconditionally (even if we have no filter
     // PHIDs) to omit rows which have no story references. These story data
     // rows are notifications or realtime alerts.
 
     $ref_table = new PhabricatorFeedStoryReference();
     $joins[] = qsprintf(
       $conn,
       'JOIN %T ref ON ref.chronologicalKey = story.chronologicalKey',
       $ref_table->getTableName());
 
     return $joins;
   }
 
   protected function buildWhereClauseParts(AphrontDatabaseConnection $conn) {
     $where = parent::buildWhereClauseParts($conn);
 
     if ($this->filterPHIDs !== null) {
       $where[] = qsprintf(
         $conn,
         'ref.objectPHID IN (%Ls)',
         $this->filterPHIDs);
     }
 
     if ($this->chronologicalKeys !== null) {
-      // NOTE: We want to use integers in the query so we can take advantage
-      // of keys, but can't use %d on 32-bit systems. Make sure all the keys
-      // are integers and then format them raw.
-
-      $keys = $this->chronologicalKeys;
-      foreach ($keys as $key) {
-        if (!ctype_digit($key)) {
-          throw new Exception(
-            pht("Key '%s' is not a valid chronological key!", $key));
-        }
-      }
+      // NOTE: We can't use "%d" to format these large integers on 32-bit
+      // systems. Historically, we formatted these into integers in an
+      // awkward way because MySQL could sometimes (?) fail to use the proper
+      // keys if the values were formatted as strings instead of integers.
+
+      // After the "qsprintf()" update to use PhutilQueryString, we can no
+      // longer do this in a sneaky way. However, the MySQL key issue also
+      // no longer appears to reproduce across several systems. So: just use
+      // strings until problems turn up?
 
       $where[] = qsprintf(
         $conn,
-        'ref.chronologicalKey IN (%LQ)',
-        $keys);
+        'ref.chronologicalKey IN (%Ls)',
+        $this->chronologicalKeys);
     }
 
     // NOTE: We may not have 64-bit PHP, so do the shifts in MySQL instead.
     // From EXPLAIN, it appears like MySQL is smart enough to compute the
     // result and make use of keys to execute the query.
 
     if ($this->rangeMin !== null) {
       $where[] = qsprintf(
         $conn,
         'ref.chronologicalKey >= (%d << 32)',
         $this->rangeMin);
     }
 
     if ($this->rangeMax !== null) {
       $where[] = qsprintf(
         $conn,
         'ref.chronologicalKey < (%d << 32)',
         $this->rangeMax);
     }
 
     return $where;
   }
 
   protected function buildGroupClause(AphrontDatabaseConnection $conn) {
     if ($this->filterPHIDs !== null) {
       return qsprintf($conn, 'GROUP BY ref.chronologicalKey');
     } else {
       return qsprintf($conn, 'GROUP BY story.chronologicalKey');
     }
   }
 
   protected function getDefaultOrderVector() {
     return array('key');
   }
 
   public function getBuiltinOrders() {
     return array(
       'newest' => array(
         'vector' => array('key'),
         'name' => pht('Creation (Newest First)'),
         'aliases' => array('created'),
       ),
       'oldest' => array(
         'vector' => array('-key'),
         'name' => pht('Creation (Oldest First)'),
       ),
     );
   }
 
   public function getOrderableColumns() {
     $table = ($this->filterPHIDs ? 'ref' : 'story');
     return array(
       'key' => array(
         'table' => $table,
         'column' => 'chronologicalKey',
         'type' => 'string',
         'unique' => true,
       ),
     );
   }
 
   protected function getPagingValueMap($cursor, array $keys) {
     return array(
       'key' => $cursor,
     );
   }
 
   protected function getResultCursor($item) {
     if ($item instanceof PhabricatorFeedStory) {
       return $item->getChronologicalKey();
     }
     return $item['chronologicalKey'];
   }
 
   protected function getPrimaryTableAlias() {
     return 'story';
   }
 
   public function getQueryApplicationClass() {
     return 'PhabricatorFeedApplication';
   }
 
 }