diff --git a/scheme/cyclone/util.sld b/scheme/cyclone/util.sld
index 9bec8218..984d3ceb 100644
--- a/scheme/cyclone/util.sld
+++ b/scheme/cyclone/util.sld
@@ -663,6 +663,7 @@
      (define . define)
      (define-syntax . define-syntax)
      (let-syntax . let-syntax)
+     (letrec-syntax . letrec-syntax)
      (define-c . define-c)
      (if . if)
      (lambda . lambda)