diff --git a/openpilot/cereal/log.capnp b/openpilot/cereal/log.capnp
index fb4867b2a..177a22045 100644
--- a/openpilot/cereal/log.capnp
+++ b/openpilot/cereal/log.capnp
@@ -1005,6 +1005,7 @@ struct DrivingModelData {
   frameIdExtra @1 :UInt32;
   frameDropPerc @6 :Float32;
   modelExecutionTime @7 :Float32;
+  big @8 :Bool;
 
   action @2 :ModelDataV2.Action;
 
diff --git a/openpilot/selfdrive/modeld/fill_model_msg.py b/openpilot/selfdrive/modeld/fill_model_msg.py
index 558f881b3..055c182f6 100644
--- a/openpilot/selfdrive/modeld/fill_model_msg.py
+++ b/openpilot/selfdrive/modeld/fill_model_msg.py
@@ -63,6 +63,7 @@ def fill_driving_model_data(msg: capnp._DynamicStructBuilder, modelv2_send: capn
   driving_model_data.frameIdExtra = modelV2.frameIdExtra
   driving_model_data.frameDropPerc = modelV2.frameDropPerc
   driving_model_data.modelExecutionTime = modelV2.modelExecutionTime
+  driving_model_data.big = modelV2.big
   driving_model_data.action = modelV2.action
   driving_model_data.meta.laneChangeState = modelV2.meta.laneChangeState
   driving_model_data.meta.laneChangeDirection = modelV2.meta.laneChangeDirection
diff --git a/openpilot/selfdrive/test/process_replay/migration.py b/openpilot/selfdrive/test/process_replay/migration.py
index 2fb8932ab..ee1fb3b94 100644
--- a/openpilot/selfdrive/test/process_replay/migration.py
+++ b/openpilot/selfdrive/test/process_replay/migration.py
@@ -149,7 +149,7 @@ def migrate_drivingModelData(msgs):
   add_ops = []
   for _, msg in msgs:
     dmd = messaging.new_message('drivingModelData', valid=msg.valid, logMonoTime=msg.logMonoTime)
-    for field in ["frameId", "frameIdExtra", "frameDropPerc", "modelExecutionTime", "action"]:
+    for field in ["frameId", "frameIdExtra", "frameDropPerc", "modelExecutionTime", "big", "action"]:
       setattr(dmd.drivingModelData, field, getattr(msg.modelV2, field))
     for meta_field in ["laneChangeState", "laneChangeState"]:
       setattr(dmd.drivingModelData.meta, meta_field, getattr(msg.modelV2.meta, meta_field))