diff --git a/poet/include/PhreeqcMatrix.hpp b/poet/include/PhreeqcMatrix.hpp
index ad8f6b1a..3162fc85 100644
--- a/poet/include/PhreeqcMatrix.hpp
+++ b/poet/include/PhreeqcMatrix.hpp
@@ -31,6 +31,14 @@ public:
    */
   PhreeqcMatrix() = default;
 
+  /**
+   * @brief Destroy the Phreeqc Matrix object
+   *
+   * There is no special cleanup needed for PhreeqcMatrix, thus the default (and
+   * implicit) destructor is used.
+   */
+  ~PhreeqcMatrix() = default;
+
   /**
    * @brief Construct a new Phreeqc Matrix object
    *