diff --git a/fpga/src/main/scala/arty/HarnessBinders.scala b/fpga/src/main/scala/arty/HarnessBinders.scala
index e1743c0b..720fafca 100644
--- a/fpga/src/main/scala/arty/HarnessBinders.scala
+++ b/fpga/src/main/scala/arty/HarnessBinders.scala
@@ -63,6 +63,7 @@ class WithArtyJTAGHarnessBinder extends OverrideHarnessBinder({
         io_jtag.TMS.i.po.map(_ := DontCare)
         io_jtag.TDO.i.po.map(_ := DontCare)
       }
+      case b: Bool =>
     }
   }
 })