diff --git a/core/compiler/compiler.factor b/core/compiler/compiler.factor
index a0599f79a1..6f75ca873d 100755
--- a/core/compiler/compiler.factor
+++ b/core/compiler/compiler.factor
@@ -1,10 +1,10 @@
 ! Copyright (C) 2004, 2008 Slava Pestov.
 ! See http://factorcode.org/license.txt for BSD license.
 USING: kernel namespaces arrays sequences io inference.backend
-inference.state generator debugger math.parser prettyprint words
-compiler.units continuations vocabs assocs alien.compiler dlists
-optimizer definitions math compiler.errors threads graphs
-generic inference ;
+inference.state generator debugger words compiler.units
+continuations vocabs assocs alien.compiler dlists optimizer
+definitions math compiler.errors threads graphs generic
+inference ;
 IN: compiler
 
 : ripple-up ( word -- )
diff --git a/core/optimizer/optimizer-tests.factor b/core/optimizer/optimizer-tests.factor
index 6c6adfa3e6..c8d7a0a0a0 100755
--- a/core/optimizer/optimizer-tests.factor
+++ b/core/optimizer/optimizer-tests.factor
@@ -370,4 +370,7 @@ HINTS: recursive-inline-hang-2 array ;
 
 HINTS: recursive-inline-hang-3 array ;
 
+! Regression
+USE: sequences.private
 
+[ ] [ { (3append) } compile ] unit-test