diff --git a/deps/v8/tools/gen-postmortem-metadata.py b/deps/v8/tools/gen-postmortem-metadata.py
index fbfda80ff8e..0acb658c53b 100644
--- a/deps/v8/tools/gen-postmortem-metadata.py
+++ b/deps/v8/tools/gen-postmortem-metadata.py
@@ -76,6 +76,7 @@ consts_misc = [
     { 'name': 'SmiTag',                 'value': 'kSmiTag' },
     { 'name': 'SmiTagMask',             'value': 'kSmiTagMask' },
     { 'name': 'SmiValueShift',          'value': 'kSmiTagSize' },
+    { 'name': 'SmiShiftSize',           'value': 'kSmiShiftSize' },
     { 'name': 'PointerSizeLog2',        'value': 'kPointerSizeLog2' },
 
     { 'name': 'prop_idx_first',