diff --git a/boards/milkymist-one/rtl/setup.v b/boards/milkymist-one/rtl/setup.v
index b20e33d5..be185289 100644
--- a/boards/milkymist-one/rtl/setup.v
+++ b/boards/milkymist-one/rtl/setup.v
@@ -31,7 +31,7 @@
 `define ENABLE_MIDI
 `define ENABLE_DMX
 `define ENABLE_IR
-//`define ENABLE_USB
+`define ENABLE_USB
 
 /*
  * System clock frequency in Hz.
diff --git a/boards/milkymist-one/synthesis/common.ucf b/boards/milkymist-one/synthesis/common.ucf
index 260a3d3d..3e4dfdb4 100644
--- a/boards/milkymist-one/synthesis/common.ucf
+++ b/boards/milkymist-one/synthesis/common.ucf
@@ -337,6 +337,6 @@ TIMESPEC "TSac97_async2" = FROM "GRPac97_clk" TO "GRPsys" TIG;
 TIMESPEC "TSvideoin_async1" = FROM "GRPsys" TO "GRPvideoin" TIG;
 TIMESPEC "TSvideoin_async2" = FROM "GRPvideoin" TO "GRPsys" TIG;
 
-#NET "usb_clk" TNM_NET = "GRPusb";
-#TIMESPEC "TSusb_async1" = FROM "GRPsys" TO "GRPusb" TIG;
-#TIMESPEC "TSusb_async2" = FROM "GRPusb" TO "GRPsys" TIG;
+NET "usb_clk" TNM_NET = "GRPusb";
+TIMESPEC "TSusb_async1" = FROM "GRPsys" TO "GRPusb" TIG;
+TIMESPEC "TSusb_async2" = FROM "GRPusb" TO "GRPsys" TIG;