diff --git a/scripts/update_payload/common.py b/scripts/update_payload/common.py
index 678fc5d..bab8a4f 100644
--- a/scripts/update_payload/common.py
+++ b/scripts/update_payload/common.py
@@ -27,7 +27,7 @@
 INPLACE_MINOR_PAYLOAD_VERSION = 1
 SOURCE_MINOR_PAYLOAD_VERSION = 2
 OPSRCHASH_MINOR_PAYLOAD_VERSION = 3
-IMGDIFF_MINOR_PAYLOAD_VERSION = 4
+PUFFDIFF_MINOR_PAYLOAD_VERSION = 4
 
 #
 # Payload operation types.
@@ -45,9 +45,9 @@
   ZERO = _CLASS.ZERO
   DISCARD = _CLASS.DISCARD
   REPLACE_XZ = _CLASS.REPLACE_XZ
-  IMGDIFF = _CLASS.IMGDIFF
+  PUFFDIFF = _CLASS.PUFFDIFF
   ALL = (REPLACE, REPLACE_BZ, MOVE, BSDIFF, SOURCE_COPY, SOURCE_BSDIFF, ZERO,
-         DISCARD, REPLACE_XZ, IMGDIFF)
+         DISCARD, REPLACE_XZ, PUFFDIFF)
   NAMES = {
       REPLACE: 'REPLACE',
       REPLACE_BZ: 'REPLACE_BZ',
@@ -58,7 +58,7 @@
       ZERO: 'ZERO',
       DISCARD: 'DISCARD',
       REPLACE_XZ: 'REPLACE_XZ',
-      IMGDIFF: 'IMGDIFF',
+      PUFFDIFF: 'PUFFDIFF',
   }
 
   def __init__(self):