diff --git a/gtsam/navigation/CombinedImuFactor.h b/gtsam/navigation/CombinedImuFactor.h
index f47ce8846..f7ea25371 100644
--- a/gtsam/navigation/CombinedImuFactor.h
+++ b/gtsam/navigation/CombinedImuFactor.h
@@ -384,5 +384,3 @@ struct traits<CombinedImuFactor> : public Testable<CombinedImuFactor> {};
 
 }  // namespace gtsam
 
-/// Add Boost serialization export for derived class
-BOOST_CLASS_EXPORT_GUID(gtsam::PreintegrationCombinedParams, "gtsam_PreintegrationCombinedParams");
diff --git a/gtsam/navigation/tests/testImuFactorSerialization.cpp b/gtsam/navigation/tests/testImuFactorSerialization.cpp
index ed72e18e9..6a9e727f2 100644
--- a/gtsam/navigation/tests/testImuFactorSerialization.cpp
+++ b/gtsam/navigation/tests/testImuFactorSerialization.cpp
@@ -42,6 +42,9 @@ BOOST_CLASS_EXPORT_GUID(gtsam::noiseModel::Isotropic,
 BOOST_CLASS_EXPORT_GUID(gtsam::SharedNoiseModel, "gtsam_SharedNoiseModel");
 BOOST_CLASS_EXPORT_GUID(gtsam::SharedDiagonal, "gtsam_SharedDiagonal");
 
+/// Add Boost serialization export for derived class
+BOOST_CLASS_EXPORT_GUID(gtsam::PreintegrationCombinedParams, "gtsam_PreintegrationCombinedParams");
+
 template <typename P>
 P getPreintegratedMeasurements() {
   // Create default parameters with Z-down and above noise paramaters