diff --git a/src/finn/custom_op/fpgadataflow/hlscustomop.py b/src/finn/custom_op/fpgadataflow/hlscustomop.py
index 2c5ecdf65c16f1e64cf3a2766d5e600534f474be..ddeda8c86f96a3007b1d0861337799bd02903560 100644
--- a/src/finn/custom_op/fpgadataflow/hlscustomop.py
+++ b/src/finn/custom_op/fpgadataflow/hlscustomop.py
@@ -606,7 +606,7 @@ compilation transformations?
             num_out_values,
             trace_file=trace_file,
             sname=sname,
-            liveness_threshold=pyverilate_get_liveness_threshold_cycles,
+            liveness_threshold=pyverilate_get_liveness_threshold_cycles(),
         )
         self.set_nodeattr("cycles_rtlsim", total_cycle_count)