1 files changed, 1 insertions, 3 deletions
diff --git a/techlibs/ice40/synth_ice40.cc b/techlibs/ice40/synth_ice40.cc
index ae6d3539c..b945889fe 100644
--- a/techlibs/ice40/synth_ice40.cc
+++ b/techlibs/ice40/synth_ice40.cc
@@ -292,11 +292,9 @@ struct SynthIce40Pass : public ScriptPass
 			run("opt_expr");
 			run("opt_clean");
 			run("check");
-			run("opt");
+			run("opt -nodffe -nosdff");
 			run("fsm");
 			run("opt");
-			run("opt_dff");
-			run("opt");
 			run("wreduce");
 			run("peepopt");
 			run("opt_clean");