diff --git a/run/serial.sh b/run/serial.sh
index d0e62af..d7b0b68 100644
--- a/run/serial.sh
+++ b/run/serial.sh
@@ -30,12 +30,11 @@ HOST_ARGS+=("-cpu_arch=${HOST_CPU}")
 [ -n "$HOST_VERSION" ] && HOST_ARGS+=("-version=${HOST_VERSION}")
 [ -n "$HOST_TIMESTAMP" ] && HOST_ARGS+=("-ts=${HOST_TIMESTAMP}")
 
-if [ "$DEBUG" = "Y" ]; then
-  echo -n "./run/host.bin "
-  echo "${HOST_ARGS[*]}" && echo
-fi
+ [ "$DEBUG" = "Y" ] && set -x
 
 ./run/host.bin "${HOST_ARGS[@]}" > /dev/null 2>&1 &
+ 
+[ "$DEBUG" = "Y" ] && { set +x; } 2>/dev/null
 
 # Configure serial ports