diff --git a/application/palemoon/components/migration/MigrationUtils.jsm b/application/palemoon/components/migration/MigrationUtils.jsm
index 882c7cf324..4461b8af0e 100644
--- a/application/palemoon/components/migration/MigrationUtils.jsm
+++ b/application/palemoon/components/migration/MigrationUtils.jsm
@@ -491,7 +491,7 @@ this.MigrationUtils = Object.freeze({
 
   // Iterates the available migrators, in the most suitable
   // order for the running platform.
-  get migrators() {
+  migrators: function* MU_migrators() {
     let migratorKeysOrdered = [
 #ifdef XP_WIN
       "firefox", "ie", "chrome", "safari"