diff --git a/mozilla/editor/base/makefile.win b/mozilla/editor/base/makefile.win
index bc2b132d71e..63a2c4411d5 100644
--- a/mozilla/editor/base/makefile.win
+++ b/mozilla/editor/base/makefile.win
@@ -110,6 +110,7 @@ LINCS=-I$(PUBLIC)\editor \
     -I$(PUBLIC)\js \
     -I$(PUBLIC)\txmgr \
     -I$(PUBLIC)\netlib \
+    -I$(PUBLIC)\pref \
     -I$(PUBLIC)\dom
 
 MAKE_OBJ_TYPE = DLL