diff --git a/lib/srfi/124.sld b/lib/srfi/124.sld
index 9afcb92a..42d88d41 100644
--- a/lib/srfi/124.sld
+++ b/lib/srfi/124.sld
@@ -1,4 +1,6 @@
 (define-library (srfi 124)
   (export make-ephemeron ephemeron? ephemeron-broken?
-          ephemeron-key ephemeron-datum)
-  (import (rename (chibi weak) (ephemeron-value ephemeron-datum))))
+          ephemeron-key ephemeron-datum reference-barrier)
+  (import (rename (chibi weak) (ephemeron-value ephemeron-datum)))
+  (begin
+    (define (reference-barrier k) (if #f #f))))