diff --git a/rtl/phy_internal.v b/rtl/phy_internal.v
index 1972b9b..31b869c 100644
--- a/rtl/phy_internal.v
+++ b/rtl/phy_internal.v
@@ -126,6 +126,7 @@ module phy_internal (
 		assign wb_ack = 0;
 		assign wb_err = wb_cyc && wb_stb;
 		assign loopback = 0;
+		assign coltest = 0;
 		assign descrambler_test = 0;
 		assign link_monitor_test = 0;
 	end endgenerate