diff --git a/sim/tb/env/driver_dut.sv b/sim/tb/env/driver_dut.sv
index c588e875ffe7b5229bc2184ec551f379b413ea73..5bb10f46494b4f5007c0e766afa8ff5715f4d451 100644
--- a/sim/tb/env/driver_dut.sv
+++ b/sim/tb/env/driver_dut.sv
@@ -1,4 +1,4 @@
-class driver_dut extends uvm_driver#(transaction_dut);
+class driver_dut extends uvm_driver#(transaction_out);
 
     virtual interface_dut vif;
  
@@ -14,7 +14,7 @@ class driver_dut extends uvm_driver#(transaction_dut);
     endfunction
  
     extern task main_phase(uvm_phase phase);
-    extern task drive_one_pkt(transaction_dut tr);
+    extern task drive_one_pkt(transaction_out tr);
 endclass
  
 task driver_dut::main_phase(uvm_phase phase);
@@ -29,7 +29,7 @@ task driver_dut::main_phase(uvm_phase phase);
     end
 endtask
  
-task driver_dut::drive_one_pkt(transaction_dut tr);
+task driver_dut::drive_one_pkt(transaction_out tr);
     byte unsigned     data_q[];
     int  data_size;