diff --git a/library/win32/win32-errors.factor b/library/win32/win32-errors.factor
index 4860a2b5c4..86c42eb217 100644
--- a/library/win32/win32-errors.factor
+++ b/library/win32/win32-errors.factor
@@ -35,6 +35,7 @@ USE: math
 USE: parser
 USE: alien
 USE: words
+USE: sequences
 
 : CONSTANT: CREATE 
     [ [ [ swons ] each ] cons define-compound POSTPONE: parsing ] 
diff --git a/library/win32/win32-server.factor b/library/win32/win32-server.factor
index 39ca7411c5..3559ddc223 100644
--- a/library/win32/win32-server.factor
+++ b/library/win32/win32-server.factor
@@ -25,7 +25,7 @@
 
 IN: win32-stream
 USING: alien errors generic kernel kernel-internals lists math namespaces
-       prettyprint stdio streams strings threads unparser win32-api
+       prettyprint sequences stdio streams strings threads unparser win32-api
        win32-io-internals io-internals ;
 
 TUPLE: win32-server this ;