add default nettype none
diff --git a/verilog/rtl/caravel.v b/verilog/rtl/caravel.v
index 24a2f3f..784fdae 100644
--- a/verilog/rtl/caravel.v
+++ b/verilog/rtl/caravel.v
@@ -1,3 +1,4 @@
+`default_nettype none
 /*--------------------------------------------------------------*/
 /* caravel, a project harness for the Google/SkyWater sky130	*/
 /* fabrication process and open source PDK			*/