diff --git a/collects/frtime/frtime-opt-lang.ss b/collects/frtime/opt/frtime-opt-lang.ss
similarity index 99%
rename from collects/frtime/frtime-opt-lang.ss
rename to collects/frtime/opt/frtime-opt-lang.ss
index 2a543d6f1a..c91ac0c092 100644
--- a/collects/frtime/frtime-opt-lang.ss
+++ b/collects/frtime/opt/frtime-opt-lang.ss
@@ -3,7 +3,7 @@
 ;; optimization, though -- that is left to the frtime-opt module.
 (module frtime-opt-lang mzscheme
   (require (prefix frtime: frtime/frtime))
-  (require-for-syntax frtime/lowered-equivs)
+  (require-for-syntax frtime/opt/lowered-equivs)
   
   ;; Export a function that is just a lifted version of a standard
   ;; function (with the same name).
diff --git a/collects/frtime/frtime-opt.ss b/collects/frtime/opt/frtime-opt.ss
similarity index 99%
rename from collects/frtime/frtime-opt.ss
rename to collects/frtime/opt/frtime-opt.ss
index 723f77efe9..d8f78a83ce 100644
--- a/collects/frtime/frtime-opt.ss
+++ b/collects/frtime/opt/frtime-opt.ss
@@ -8,7 +8,7 @@
   (provide (rename my-module-begin #%module-begin)
            #%app #%top #%datum optimize-expr optimize-module dont-optimize)
   
-  (require-for-syntax frtime/lowered-equivs)
+  (require-for-syntax frtime/opt/lowered-equivs)
   (require-for-syntax (only srfi/1 lset-union lset-difference every))
   (require-for-syntax mzlib/list)
   (require (only frtime/core/frp super-lift undefined undefined?))
diff --git a/collects/frtime/lowered-equivs.ss b/collects/frtime/opt/lowered-equivs.ss
similarity index 100%
rename from collects/frtime/lowered-equivs.ss
rename to collects/frtime/opt/lowered-equivs.ss