add default nettype none
diff --git a/verilog/gl/user_id_programming.v b/verilog/gl/user_id_programming.v
index 715e184..b941b6b 100644
--- a/verilog/gl/user_id_programming.v
+++ b/verilog/gl/user_id_programming.v
@@ -1,3 +1,4 @@
+`default_nettype none
 /* Generated by Yosys 0.9+3621 (git sha1 84e9fa7, gcc 8.3.1 -fPIC -Os) */
 
 module user_id_programming(vdd1v8, vss, VPWR, VGND, mask_rev);