diff --git a/deps/v8/tools/gen-postmortem-metadata.py b/deps/v8/tools/gen-postmortem-metadata.py
index b617573d9c7..108fde06e08 100644
--- a/deps/v8/tools/gen-postmortem-metadata.py
+++ b/deps/v8/tools/gen-postmortem-metadata.py
@@ -121,6 +121,10 @@
         'value': 'Map::ElementsKindBits::kShift' },
     { 'name': 'bit_field3_dictionary_map_shift',
         'value': 'Map::DictionaryMap::kShift' },
+    { 'name': 'fieldindex_mask',
+        'value': 'PropertyDetails::FieldIndexField::kMask' },
+    { 'name': 'fieldindex_shift',
+        'value': 'PropertyDetails::FieldIndexField::kShift' },
 
     { 'name': 'off_fp_context',
         'value': 'StandardFrameConstants::kContextOffset' },
@@ -146,7 +150,7 @@
     'Map, instance_size, int, kInstanceSizeOffset',
     'Map, bit_field, char, kBitFieldOffset',
     'Map, bit_field2, char, kBitField2Offset',
-    'Map, bit_field3, SMI, kBitField3Offset',
+    'Map, bit_field3, int, kBitField3Offset',
     'Map, prototype, Object, kPrototypeOffset',
     'NameDictionaryShape, prefix_size, int, kPrefixSize',
     'NameDictionaryShape, entry_size, int, kEntrySize',