diff --git a/flow/simulators/ivlog_sim.sh b/flow/simulators/ivlog_sim.sh
index 6c7613cceeb8202597ba6c6e6867b2da55a07a1e..97571d636eb0b6982129e92b186827510ff447f4 100755
--- a/flow/simulators/ivlog_sim.sh
+++ b/flow/simulators/ivlog_sim.sh
@@ -12,5 +12,5 @@
 #!/usr/bin/env bash
 
 mkdir -p $SHA_2_ACC_DIR/simulate/sim/ 
-iverilog -I $SHA_2_ACC_DIR/hdl/verif/ -I $SHA_2_ACC_DIR/hdl/src/ -g2012 -o $SHA_2_ACC_DIR/simulate/sim/engine_sim.vvp $SHA_2_ACC_DIR/hdl/verif/tb_engine.sv
-cd $SHA_2_ACC_DIR/simulate/sim/ && vvp engine_sim.vvp
\ No newline at end of file
+iverilog -I $SHA_2_ACC_DIR/hdl/verif/ -I $SHA_2_ACC_DIR/hdl/src/ -g2012 -o $SHA_2_ACC_DIR/simulate/sim/message_build.vvp $SHA_2_ACC_DIR/hdl/verif/tb_message_build.sv
+cd $SHA_2_ACC_DIR/simulate/sim/ && vvp message_build.vvp
\ No newline at end of file