add default nettype none
diff --git a/verilog/rtl/simple_por.v b/verilog/rtl/simple_por.v
index f308fbf..2c51e9a 100644
--- a/verilog/rtl/simple_por.v
+++ b/verilog/rtl/simple_por.v
@@ -1,3 +1,4 @@
+`default_nettype none
 `timescale 1 ns / 1 ps
 
 module simple_por(