diff --git a/emulator/rio-firmware/.gitignore b/emulator/rio-firmware/.gitignore
new file mode 100644
index 0000000..288fe7d
--- /dev/null
+++ b/emulator/rio-firmware/.gitignore
@@ -0,0 +1 @@
+*.stderr
diff --git a/emulator/rio-firmware/disasm.stderr b/emulator/rio-firmware/disasm.stderr
deleted file mode 100644
index 6ac1a3f..0000000
--- a/emulator/rio-firmware/disasm.stderr
+++ /dev/null
@@ -1 +0,0 @@
-decoded 2728 insns, 328 labels, 112 call targets