diff --git a/res/boot/boot_dump.py b/res/boot/boot_dump.py
index 729cd1542339caf01ab2a5deae53714abbe55630..202b1abc62f7f82b51777dfde9830040b1100eea 100644
--- a/res/boot/boot_dump.py
+++ b/res/boot/boot_dump.py
@@ -8,7 +8,7 @@ def print_buffer(filename):
     try: data = file.read()
     finally: file.close()
 
-    buffer = [str(byte) for byte in data]
+    buffer = [str(ord(byte)) for byte in data]
     buffer_s = ", ".join(buffer)
 
     print("[%s]" % buffer_s)