diff --git a/mkbootimg/mkbootimg b/mkbootimg/mkbootimg
index aea2585..f95d703 100755
--- a/mkbootimg/mkbootimg
+++ b/mkbootimg/mkbootimg
@@ -19,6 +19,7 @@
 from os import fstat
 from struct import pack
 from hashlib import sha1
+import sys
 
 def filesize(f):
     if f is None:
@@ -133,8 +134,10 @@
     img_id = write_header(args)
     write_data(args)
     if args.id:
-        print('0x' + ''.join('{:02x}'.format(ord(c)) for c in img_id))
-
+        if isinstance(img_id, str):
+            # Python 2's struct.pack returns a string, but py3 returns bytes.
+            img_id = [ord(x) for x in img_id]
+        print('0x' + ''.join('{:02x}'.format(c) for c in img_id))
 
 if __name__ == '__main__':
     main()
diff --git a/toolbox/generate-input.h-labels.py b/toolbox/generate-input.h-labels.py
index 30485a0..a2b9111 100755
--- a/toolbox/generate-input.h-labels.py
+++ b/toolbox/generate-input.h-labels.py
@@ -16,6 +16,7 @@
 #
 # pylint: disable=bad-indentation,bad-continuation
 
+from __future__ import print_function
 import os
 import re
 import sys
@@ -72,11 +73,11 @@
         ff_list.append(name)
 
 def Dump(struct_name, values):
-  print 'static struct label %s[] = {' % (struct_name)
+  print('static struct label %s[] = {' % (struct_name))
   for value in values:
-    print '    LABEL(%s),' % (value)
-  print '    LABEL_END,'
-  print '};'
+    print('    LABEL(%s),' % (value))
+  print('    LABEL_END,')
+  print('};')
 
 Dump("input_prop_labels", input_prop_list)
 Dump("ev_labels", ev_list)