diff --git a/test_regress/t/t_property_disable_iff_counter.py b/test_regress/t/t_property_disable_iff_counter.py
index 36fbd6160..941ecc46f 100755
--- a/test_regress/t/t_property_disable_iff_counter.py
+++ b/test_regress/t/t_property_disable_iff_counter.py
@@ -13,7 +13,7 @@ test.scenarios('simulator')
 
 test.sim_time = 16000
 
-test.compile(timing_loop=True, verilator_flags2=['--assert', '--timing'])
+test.compile(timing_loop=True, verilator_flags2=['--assert', '--timing', '-Wno-UNOPTTHREADS'])
 
 test.execute()