diff --git a/rtl/serv_rf_top.v b/rtl/serv_rf_top.v
index de00d38..ef0ae41 100644
--- a/rtl/serv_rf_top.v
+++ b/rtl/serv_rf_top.v
@@ -161,3 +161,4 @@ module serv_rf_top
       .i_dbus_ack   (i_dbus_ack));
 
 endmodule
+`default_nettype wire
diff --git a/rtl/serv_top.v b/rtl/serv_top.v
index 9c9ea9d..65b59b0 100644
--- a/rtl/serv_top.v
+++ b/rtl/serv_top.v
@@ -492,3 +492,4 @@ module serv_top
 `endif
 
 endmodule
+`default_nettype wire