diff --git a/test_regress/t/t_gate_ormux.pl b/test_regress/t/t_gate_ormux.pl
index bd2679147..7a715a4e7 100755
--- a/test_regress/t/t_gate_ormux.pl
+++ b/test_regress/t/t_gate_ormux.pl
@@ -14,6 +14,7 @@ $Self->{sim_time} = $Self->{cycles} * 10 + 1000;
 
 compile(
     v_flags2 => ["+define+SIM_CYCLES=$Self->{cycles}",],
+    verilator_flags2=>["-Wno-UNOPTTHREADS"],
     );
 
 execute(