diff --git a/include/htool/basic_types/matrix.hpp b/include/htool/basic_types/matrix.hpp
index bee3f254..b9227085 100644
--- a/include/htool/basic_types/matrix.hpp
+++ b/include/htool/basic_types/matrix.hpp
@@ -209,7 +209,7 @@ class Matrix {
     the number of columns is set to _nbc_.
     */
     void resize(const int nbr, const int nbc, T value = 0) {
-        if (m_data != nullptr && m_is_owning_data) {
+        if (m_is_owning_data) {
             delete[] m_data;
         }
         m_data           = new T[nbr * nbc];