diff --git a/src/DataObjects/QueuedJobDescriptor.php b/src/DataObjects/QueuedJobDescriptor.php
index cedaaffc..09e67b64 100644
--- a/src/DataObjects/QueuedJobDescriptor.php
+++ b/src/DataObjects/QueuedJobDescriptor.php
@@ -52,10 +52,9 @@
  * @property bool $NotifiedBroken
  * @property int $WorkerCount
  *
- * @method Member RunAs() Member to run this job as
- *
  * @author Marcus Nyeholt <marcus@symbiote.com.au>
  * @license BSD http://silverstripe.org/bsd-license/
+ * @method Member RunAs()
  */
 class QueuedJobDescriptor extends DataObject
 {
diff --git a/src/Extensions/ScheduledExecutionExtension.php b/src/Extensions/ScheduledExecutionExtension.php
index fd23caba..ead6cc4f 100644
--- a/src/Extensions/ScheduledExecutionExtension.php
+++ b/src/Extensions/ScheduledExecutionExtension.php
@@ -23,6 +23,7 @@
  *
  * @author marcus@symbiote.com.au
  * @license BSD License http://silverstripe.org/bsd-license/
+ * @method QueuedJobDescriptor ScheduledJob()
  */
 class ScheduledExecutionExtension extends DataExtension
 {
diff --git a/src/Services/QueuedJobService.php b/src/Services/QueuedJobService.php
index ea98b8ea..70c89f36 100644
--- a/src/Services/QueuedJobService.php
+++ b/src/Services/QueuedJobService.php
@@ -729,7 +729,8 @@ protected function grabMutex(QueuedJobDescriptor $jobDescriptor)
         try {
             // Start a transaction which will hold until we have a lock on this descriptor.
             DB::get_conn()->withTransaction(function () use ($descriptorId) {
-                $query = 'SELECT "ID" FROM "QueuedJobDescriptor" WHERE "ID" = %s AND "Worker" IS NULL FOR UPDATE';
+                $forUpdate = DB::getConfig()['type'] == 'SQLite3Database' ? '' : ' FOR UPDATE';
+                $query = 'SELECT "ID" FROM "QueuedJobDescriptor" WHERE "ID" = %s AND "Worker" IS NULL' . $forUpdate;
 
                 $row = DB::query(sprintf($query, Convert::raw2sql($descriptorId)))->record();