diff --git a/lib/srfi/124.sld b/lib/srfi/124.sld
index 42d88d41..c99029ce 100644
--- a/lib/srfi/124.sld
+++ b/lib/srfi/124.sld
@@ -1,6 +1,7 @@
 (define-library (srfi 124)
   (export make-ephemeron ephemeron? ephemeron-broken?
           ephemeron-key ephemeron-datum reference-barrier)
-  (import (rename (chibi weak) (ephemeron-value ephemeron-datum)))
+  (import (rename (chibi weak) (ephemeron-value ephemeron-datum))
+          (only (scheme base) define if))
   (begin
     (define (reference-barrier k) (if #f #f))))