diff --git a/resource/english/PredicEng.gf b/resource/english/PredicEng.gf
index d90440c04..062d441d2 100644
--- a/resource/english/PredicEng.gf
+++ b/resource/english/PredicEng.gf
@@ -4,7 +4,7 @@
 concrete PredicEng of Predic = CategoriesEng ** 
   open Prelude, SyntaxEng, DeptypEng in {
 
-  flags optimize=all ;
+  flags optimize=all_subs ;
 
   lincat
     VType, CType = SS ;