diff --git a/racket/syndicate/actor.rkt b/racket/syndicate/actor.rkt
index ec58243..f161ca3 100644
--- a/racket/syndicate/actor.rkt
+++ b/racket/syndicate/actor.rkt
@@ -22,6 +22,8 @@
 
          patch-without-linkage
 
+         ? ;; from pattern.rkt
+
          ;;----------------------------------------
          (struct-out actor-state)
          pretty-print-actor-state
diff --git a/racket/syndicate/pattern.rkt b/racket/syndicate/pattern.rkt
index 76a05be..eb626d3 100644
--- a/racket/syndicate/pattern.rkt
+++ b/racket/syndicate/pattern.rkt
@@ -4,6 +4,7 @@
 (provide (for-syntax analyze-pattern)
          (struct-out predicate-match)
          match-value/captures
+         ?
          )
 
 (require (for-syntax racket/base))