diff --git a/expander_compiler/src/builder/final_build_opt.rs b/expander_compiler/src/builder/final_build_opt.rs
index 9135831..65f80c1 100644
--- a/expander_compiler/src/builder/final_build_opt.rs
+++ b/expander_compiler/src/builder/final_build_opt.rs
@@ -458,8 +458,8 @@ impl<C: Config> Builder<C> {
             + cost_of_possible_references::<C>(&[0, 1, 0], ref_count.add, ref_count.mul);
         should_compress |= cost_compress < cost_no_compress;
         should_compress &= e.degree() > 0;
-        if should_compress && false {
-            // Currently, this don't consider the cost of relay, so it's disabled
+        if should_compress {
+            // Currently, this don't consider the cost of relay, so it's not good in some cases
             // TODO: fix this
             let es = self.to_single(e);
             self.in_var_exprs.push(es);
diff --git a/expander_compiler/src/circuit/config.rs b/expander_compiler/src/circuit/config.rs
index 83b9743..9875b86 100644
--- a/expander_compiler/src/circuit/config.rs
+++ b/expander_compiler/src/circuit/config.rs
@@ -42,5 +42,9 @@ impl Config for GF2Config {
 
     const CONFIG_ID: usize = 3;
 
+    // temporary fix for Keccak_GF2
+    // TODO: measure actual costs
+    const COST_MUL: usize = 200;
+
     const ENABLE_RANDOM_COMBINATION: bool = false;
 }