diff --git a/src/Jobs.hs b/src/Jobs.hs
index 494b83c2f..423411dc3 100644
--- a/src/Jobs.hs
+++ b/src/Jobs.hs
@@ -69,9 +69,7 @@ jLocked :: QueuedJobId -> (QueuedJob -> Handler a) -> Handler a
 jLocked jId act = do
   hasLock <- liftIO $ newTVarIO False
   val <- runDB $ do
-    [executeQQ|
-      SET TRANSACTION ISOLATION LEVEL SERIALIZABLE
-    |]
+    setSerializable
     j@QueuedJob{..} <- maybe (throwM $ JNonexistant jId) return =<< get jId
     maybe (return ()) throwM $ JLocked <$> pure jId <*> queuedJobLockInstance <*> queuedJobLockTime
     case fromJSON queuedJobContent :: Aeson.Result Job of
@@ -89,9 +87,15 @@ jLocked jId act = do
   act val `finally` whenM (liftIO . atomically $ readTVar hasLock) jUnlock
   where
     jUnlock :: Handler ()
-    jUnlock = runDB $ update jId [ QueuedJobLockInstance =. Nothing
-                                 , QueuedJobLockTime =. Nothing
-                                 ]
+    jUnlock = runDB $ do
+      setSerializable
+      update jId [ QueuedJobLockInstance =. Nothing
+                 , QueuedJobLockTime =. Nothing
+                 ]
+
+    setSerializable = [executeQQ|
+        SET TRANSACTION ISOLATION LEVEL SERIALIZABLE
+      |]
 
 
 writeJobCtl :: (MonadHandler m, HandlerSite m ~ UniWorX) => JobCtl -> m ()