diff --git a/test/gtest_imu.cpp b/test/gtest_imu.cpp
index faa4a99ed86d82d8841228168ae875104dbfcb8e..fceec6fc83ad7066f22439267192dd405a3ca63a 100644
--- a/test/gtest_imu.cpp
+++ b/test/gtest_imu.cpp
@@ -1550,7 +1550,8 @@ TEST_F(Process_Factor_Imu, bootstrap)
 
     // Vector6d data(0,0,9.806, 0,0,0); // gravity on Z
     // Vector6d data(0.0, 9.806, 0.0,  0.0, 0.0, 0.0); // gravity on Y
-    Vector6d data{ 0.0, 9.806, 0.0,  0.0, 0.0, 0.0 } ; // gravity on Y
+    Vector6d data;
+    data <<  0.0, 9.806, 0.0,  0.0, 0.0, 0.0  ; // gravity on Y
 
     capture_imu = std::make_shared<CaptureImu>(0.0, sensor_imu, data, Matrix6d::Identity());