add default nettype none
diff --git a/verilog/rtl/mprj_ctrl.v b/verilog/rtl/mprj_ctrl.v
index e70ac93..6b17fe2 100644
--- a/verilog/rtl/mprj_ctrl.v
+++ b/verilog/rtl/mprj_ctrl.v
@@ -1,3 +1,4 @@
+`default_nettype none
 module mprj_ctrl_wb #(
     parameter BASE_ADR  = 32'h 2300_0000,
     parameter XFER      = 8'h 00,