--- a/browser/components/migration/tests/unit/test_MigrationUtils_timedRetry.js
+++ b/browser/components/migration/tests/unit/test_MigrationUtils_timedRetry.js
@@ -5,22 +5,22 @@ XPCOMUtils.defineLazyModuleGetter(this, 
 
 let tmpFile = FileUtils.getDir("TmpD", [], true);
 let dbConn;
 
 add_task(async function setup() {
   tmpFile.append("TestDB");
   dbConn = await Sqlite.openConnection({ path: tmpFile.path });
 
-  do_register_cleanup(() => {
-    dbConn.close();
-    OS.File.remove(tmpFile.path);
+  do_register_cleanup(async () => {
+    await dbConn.close();
+    await OS.File.remove(tmpFile.path);
   });
 });
 
 add_task(async function testgetRowsFromDBWithoutLocksRetries() {
   let promise = MigrationUtils.getRowsFromDBWithoutLocks(tmpFile.path,
                                                          "Temp DB",
                                                          "SELECT * FROM moz_temp_table");
   await new Promise(resolve => do_timeout(50, resolve));
-  dbConn.execute("CREATE TABLE moz_temp_table (id INTEGER PRIMARY KEY)");
+  await dbConn.execute("CREATE TABLE moz_temp_table (id INTEGER PRIMARY KEY)");
   await promise;
 });