diff --git a/src/synth_rapidsilicon.cc b/src/synth_rapidsilicon.cc
index b7b77a96..49bd9a5c 100644
--- a/src/synth_rapidsilicon.cc
+++ b/src/synth_rapidsilicon.cc
@@ -4406,7 +4406,7 @@ static void show_sig(const RTLIL::SigSpec &sig)
            run("techmap -map" + techMaplutArgs);
 #endif
         }
-
+        run("opt_clean");
         if (check_label("blif")) {
             if (!blif_file.empty()) {
                 run(stringf("write_blif %s", blif_file.c_str()));