diff --git a/sbysrc/sby_bmc.py b/sbysrc/sby_bmc.py
index 1c146f7..6a1970f 100644
--- a/sbysrc/sby_bmc.py
+++ b/sbysrc/sby_bmc.py
@@ -113,10 +113,9 @@ def run_abc(job, engine_idx, engine):
                 t.terminate()
 
         if job.status == "FAIL":
-            copyfile("%s/model/design_aiger.aim" % job.workdir, "%s/engine_%d/trace.aim" % (job.workdir, engine_idx))
             task2 = SbyTask(job, "engine_%d" % engine_idx, job.model("smt2"),
                     ("cd %s; yosys-smtbmc --noprogress -t %d --dump-vcd engine_%d/trace.vcd --dump-vlogtb engine_%d/trace_tb.v " +
-                     "--dump-smtc engine_%d/trace.smtc --aig engine_%d/trace --aig-noheader model/design_smt2.smt2") %
+                     "--dump-smtc engine_%d/trace.smtc --aig model/design_aiger.aim:engine_%d/trace.aiw --aig-noheader model/design_smt2.smt2") %
                             (job.workdir, job.opt_depth, engine_idx, engine_idx, engine_idx, engine_idx),
                     logfile=open("%s/engine_%d/logfile2.txt" % (job.workdir, engine_idx), "w"))