diff --git a/modules/core/src/math/transformation/vpThetaUVector.cpp b/modules/core/src/math/transformation/vpThetaUVector.cpp
index 7d61de8150..da304f8745 100644
--- a/modules/core/src/math/transformation/vpThetaUVector.cpp
+++ b/modules/core/src/math/transformation/vpThetaUVector.cpp
@@ -101,7 +101,7 @@ vpThetaUVector::vpThetaUVector(double tux, double tuy, double tuz) : vpRotationV
 /*!
   Build a \f$\theta {\bf u}\f$ vector from a vector of 3 angles in radian.
 */
-vpThetaUVector::vpThetaUVector(const std::vector<double> &tu) { buildFrom(tu); }
+vpThetaUVector::vpThetaUVector(const std::vector<double> &tu) : vpRotationVector(3) { buildFrom(tu); }
 
 /*!
   Converts an homogeneous matrix into a \f$\theta {\bf u}\f$ vector.
diff --git a/modules/core/test/tools/io/testNPZ.cpp b/modules/core/test/tools/io/testNPZ.cpp
index a1cec45dcf..7c4bdf4778 100644
--- a/modules/core/test/tools/io/testNPZ.cpp
+++ b/modules/core/test/tools/io/testNPZ.cpp
@@ -175,8 +175,7 @@ TEST_CASE("Test visp::cnpy::npy_load/npz_save", "[visp::cnpy I/O]")
       u[2] = i*4 + 2;
       u.normalize();
       double theta = vpMath::rad(5*i + 2);
-      std::vector<double> vec { theta*u[0], theta*u[1], theta*u[2] };
-      vpThetaUVector tu(vec[0], vec[1], vec[2]);
+      vpThetaUVector tu(std::vector<double>{ theta *u[0], theta *u[1], theta *u[2] });
       // std::cout << "theta=" << tu.getTheta() << " ; u=" << tu.getU().transpose() << std::endl;
 
       vpTranslationVector trans(i*4 + 10, i*4 + 20, i*4 + 30);