diff --git a/bootstrap.sh b/bootstrap.sh
new file mode 100644
index 0000000..f319346
--- /dev/null
+++ b/bootstrap.sh
@@ -0,0 +1,15 @@
+#!/bin/sh
+set -e
+
+echo "======> Building seed Drifloon using uxnmin"
+make -sC utils clean
+make -sC utils drifloon.rom
+echo "======> Building Drifloon using utils/drifloon.rom (seed)"
+dune exec -- ./exe/uxnemu.exe utils/drifloon.rom < utils/drifloon.tal > drifloon-ocaml.rom
+echo "======> Comparing ROMs (should be identical)"
+cmp drifloon-ocaml.rom utils/drifloon.rom
+echo "======> Building Drifloon using drifloon-ocaml.rom"
+dune exec -- ./exe/uxnemu.exe drifloon-ocaml.rom < utils/drifloon.tal > drifloon-boot.rom
+echo "======> Comparing ROMs (should be identical)"
+cmp drifloon-ocaml.rom drifloon-boot.rom
+echo "======> Done!"
diff --git a/exe/uxnemu.ml b/exe/uxnemu.ml
index 7008131..2ea6bbd 100644
--- a/exe/uxnemu.ml
+++ b/exe/uxnemu.ml
@@ -18,7 +18,7 @@ let rec run m pc =
   in
   try Machine.dispatch ~trace:debug m pc with
   | effect Machine.Trace (pc, instr, args), k when debug ->
-      Fmt.epr "PC = %04x | %6s : %a@." pc (Instr.to_string instr)
+      Fmt.epr "PC = %04x | %6s %a@." pc (Instr.to_string instr)
         (Fmt.list ~sep:(Fmt.any " ") (Fmt.fmt "%02x"))
         args;
       Out_channel.flush stderr;