diff --git a/collects/unstable/private/expand.rkt b/collects/unstable/private/expand.rkt
deleted file mode 100644
index 3b35525b87..0000000000
--- a/collects/unstable/private/expand.rkt
+++ /dev/null
@@ -1,16 +0,0 @@
-#lang racket/base
-(require (for-syntax racket/base))
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-;;
-;;  Trampoline Expansion
-;;
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-
-(provide #%trampoline)
-
-(define-syntax (#%trampoline stx)
-  (syntax-case stx ()
-    [(_ thunk)
-     (procedure? (syntax-e #'thunk))
-     (#%app (syntax-e #'thunk))]))