add default nettype none
diff --git a/verilog/dv/dummy_slave.v b/verilog/dv/dummy_slave.v
index 857ce0e..52ec1cd 100644
--- a/verilog/dv/dummy_slave.v
+++ b/verilog/dv/dummy_slave.v
@@ -1,3 +1,4 @@
+`default_nettype none
 module dummy_slave(
     input wb_clk_i,
     input wb_rst_i,