diff --git a/build/bakefiles/Bakefiles.bkgen b/build/bakefiles/Bakefiles.bkgen
index 3566b49ae8..3926928df8 100644
--- a/build/bakefiles/Bakefiles.bkgen
+++ b/build/bakefiles/Bakefiles.bkgen
@@ -137,7 +137,8 @@
     <add-flags formats="borland,dmars_smake,dmars,mingw,msvc,watcom">
         -DWRITE_OPTIONS_FILE=0
     </add-flags>
-    <del-flags files="wx.bkl">
+    <del-flags formats="borland,dmars_smake,dmars,mingw,msvc,watcom"
+               files="wx.bkl">
         -DWRITE_OPTIONS_FILE=0
     </del-flags>