diff --git a/build/bakefiles/files.bkl b/build/bakefiles/files.bkl
index 3f969b0808..cbd108ea96 100644
--- a/build/bakefiles/files.bkl
+++ b/build/bakefiles/files.bkl
@@ -1091,7 +1091,6 @@ IMPORTANT: please read docs/tech/tn0016.txt before modifying this file!
     src/msw/notebook.cpp
     src/msw/ole/access.cpp
     src/msw/ownerdrw.cpp
-    src/msw/penwin.cpp
     src/msw/printdlg.cpp
     src/msw/printwin.cpp
     src/msw/radiobox.cpp