diff --git a/scripts/imgtool/image.py b/scripts/imgtool/image.py
index 7eb6c0c..358b1f2 100644
--- a/scripts/imgtool/image.py
+++ b/scripts/imgtool/image.py
@@ -6,7 +6,7 @@
 import hashlib
 import struct
 
-IMAGE_MAGIC = 0x96f3b83c
+IMAGE_MAGIC = 0x96f3b83d
 IMAGE_HEADER_SIZE = 32
 
 # Image header flags.