diff --git a/basis/compiler/cfg/optimizer/optimizer.factor b/basis/compiler/cfg/optimizer/optimizer.factor
index 84eb8a84d1..529f93e9fb 100644
--- a/basis/compiler/cfg/optimizer/optimizer.factor
+++ b/basis/compiler/cfg/optimizer/optimizer.factor
@@ -37,8 +37,8 @@ SYMBOL: check-optimizer?
         compute-liveness
         alias-analysis
         value-numbering
-        fold-branches
-        compute-predecessors
+        ! fold-branches
+        ! compute-predecessors
         eliminate-dead-code
         eliminate-write-barriers
         eliminate-phis