diff --git a/lib/plugins.js b/lib/plugins.js
index 3bdf0181..fb6e561d 100644
--- a/lib/plugins.js
+++ b/lib/plugins.js
@@ -370,7 +370,7 @@ function plugins (settings, deviceId) {
     const sql = `DELETE FROM machine_network_heartbeat h
         USING (SELECT device_id, max(created) as lastEntry FROM machine_network_heartbeat GROUP BY device_id) d
         WHERE d.device_id = h.device_id AND h.created < d.lastEntry`
-    db.none(sql)
+    return db.none(sql)
   }
 
   function isHd (tx) {
diff --git a/lib/poller.js b/lib/poller.js
index e657bb1e..fefb8d16 100644
--- a/lib/poller.js
+++ b/lib/poller.js
@@ -152,7 +152,7 @@ const cleanOldFailedPDF417Scans = () => {
   /* NOTE: Small caveat to mtime: last time the file was written to. */
   const isOld = filestat => filestat.mtimeMs < old
 
-  readdirRec(path.join(OPERATOR_DATA_DIR, 'id-operator'))
+  return readdirRec(path.join(OPERATOR_DATA_DIR, 'id-operator'))
     .then(entries => Promise.all(
       entries
         .filter(entry => entry.isFile() && isPDF417Scan(entry))
@@ -178,7 +178,7 @@ const cleanOldFailedQRScans = () => {
     return then < old
   }
 
-  readdirRec(path.join(OPERATOR_DATA_DIR, 'failedQRScans'))
+  return readdirRec(path.join(OPERATOR_DATA_DIR, 'failedQRScans'))
     .then(entries => Promise.all(
       entries
         .filter(entry => entry.isFile() && isOld(entry.path))