diff --git a/gtsam/navigation/ImuFactor.cpp b/gtsam/navigation/ImuFactor.cpp
index e49168c43..8bbfc95b2 100644
--- a/gtsam/navigation/ImuFactor.cpp
+++ b/gtsam/navigation/ImuFactor.cpp
@@ -33,6 +33,7 @@ using namespace std;
 //------------------------------------------------------------------------------
 void PreintegratedImuMeasurements::print(const string& s) const {
   PreintegrationBase::print(s);
+  cout << "    preintMeasCov \n[" << preintMeasCov_ << "]" << endl;
 }
 
 //------------------------------------------------------------------------------