diff --git a/core.rkt b/core.rkt
index 6e11145..eff7183 100644
--- a/core.rkt
+++ b/core.rkt
@@ -12,6 +12,8 @@
 	 (struct-out quit)
 	 (struct-out process)
 	 (struct-out transition)
+	 ? ;; imported from pattern.rkt
+	 wildcard?
 	 sub
 	 pub
 	 spawn
diff --git a/ground.rkt b/ground.rkt
index 4571a3f..52c48ee 100644
--- a/ground.rkt
+++ b/ground.rkt
@@ -3,7 +3,6 @@
 (require racket/match)
 (require racket/list)
 (require "core.rkt")
-(require "pattern.rkt")
 
 (provide (struct-out event)
 	 run-actor)