diff --git a/sim/tb/tb_DP16KD_18b_sync_nowriteout_unregistered.v b/sim/tb/tb_DP16KD_18b_sync_nowriteout_unregistered.v
index eb6400d..bca5804 100644
--- a/sim/tb/tb_DP16KD_18b_sync_nowriteout_unregistered.v
+++ b/sim/tb/tb_DP16KD_18b_sync_nowriteout_unregistered.v
@@ -25,6 +25,8 @@ module tb_DP16KD_18b_sync_nowriteout_unregistered#(
   wire [DATA_WIDTH_B-1:0] DOB;
   reg [DATA_WIDTH_A-1:0] WANTA;
   reg [DATA_WIDTH_B-1:0] WANTB;
+  wire BADA = DOA !== WANTA;
+  wire BADB = DOB !== WANTB;
   reg [239:0] TESTNAME;
 
   wire [DATA_WIDTH_A-1:0] UNDEFA = {DATA_WIDTH_A{1'bx}};