diff --git a/module/ice-9/boot-9.scm b/module/ice-9/boot-9.scm
index 5ac01b8..619d761 100644
--- a/module/ice-9/boot-9.scm
+++ b/module/ice-9/boot-9.scm
@@ -386,6 +386,7 @@ If there is no handler at all, Guile prints an error and then exits."
 (define generate-temporaries #f)
 (define bound-identifier=? #f)
 (define free-identifier=? #f)
+(define syntax-binding-info #f)
 
 ;; $sc-dispatch is an implementation detail of psyntax. It is used by
 ;; expanded macros, to dispatch an input against a set of patterns.