diff --git a/VexRiscv/sim/murax.cfg b/VexRiscv/sim/murax.cfg
index a1eadf3..a842685 100644
--- a/VexRiscv/sim/murax.cfg
+++ b/VexRiscv/sim/murax.cfg
@@ -1,3 +1,5 @@
+transport select jtag
+
 set  _ENDIAN little
 set _TAP_TYPE 1234