1 files changed, 2 insertions, 1 deletions
diff --git a/lib/internal/modules/esm/module_map.js b/lib/internal/modules/esm/module_map.js
index 01521fb788..41adc0079a 100644
--- a/lib/internal/modules/esm/module_map.js
+++ b/lib/internal/modules/esm/module_map.js
@@ -16,7 +16,8 @@ class ModuleMap extends SafeMap {
   }
   set(url, job) {
     validateString(url, 'url');
-    if (job instanceof ModuleJob !== true) {
+    if (job instanceof ModuleJob !== true &&
+        typeof job !== 'function') {
       throw new ERR_INVALID_ARG_TYPE('job', 'ModuleJob', job);
     }
     debug(`Storing ${url} in ModuleMap`);