diff --git a/y2023/localizer/localizer.h b/y2023/localizer/localizer.h
index ba5b1cf..accb0c1 100644
--- a/y2023/localizer/localizer.h
+++ b/y2023/localizer/localizer.h
@@ -83,8 +83,8 @@
       TargetEstimateDebug::Builder *builder);
 
   void SendOutput();
-  flatbuffers::Offset<frc971::control_loops::drivetrain::LocalizerState>
-  PopulateState(flatbuffers::FlatBufferBuilder *fbb) const;
+  static flatbuffers::Offset<frc971::control_loops::drivetrain::LocalizerState>
+  PopulateState(const State &X_hat, flatbuffers::FlatBufferBuilder *fbb);
   flatbuffers::Offset<ImuStatus> PopulateImu(
       flatbuffers::FlatBufferBuilder *fbb) const;
   void SendStatus();