diff --git a/include/openPMD/IO/IOTask.hpp b/include/openPMD/IO/IOTask.hpp
index 8ded6f1775..f32fc36785 100644
--- a/include/openPMD/IO/IOTask.hpp
+++ b/include/openPMD/IO/IOTask.hpp
@@ -30,6 +30,7 @@
 #include "openPMD/backend/Attribute.hpp"
 #include "openPMD/backend/ParsePreference.hpp"
 
+#include <cstddef>
 #include <map>
 #include <memory>
 #include <string>
@@ -680,15 +681,23 @@ template <>
 struct OPENPMDAPI_EXPORT Parameter<Operation::DEREGISTER>
     : public AbstractParameter
 {
-    Parameter() = default;
-    Parameter(Parameter const &) : AbstractParameter()
+    Parameter(void const *ptr_in) : former_parent(ptr_in)
     {}
 
+    Parameter(Parameter const &) = default;
+    Parameter(Parameter &&) = default;
+
+    Parameter &operator=(Parameter const &) = default;
+    Parameter &operator=(Parameter &&) = default;
+
     std::unique_ptr<AbstractParameter> to_heap() && override
     {
         return std::make_unique<Parameter<Operation::DEREGISTER>>(
             std::move(*this));
     }
+
+    // Just for verbose logging.
+    void const *former_parent = nullptr;
 };
 
 /** @brief Self-contained description of a single IO operation.
diff --git a/src/IO/AbstractIOHandlerImpl.cpp b/src/IO/AbstractIOHandlerImpl.cpp
index 90e0e4a9be..edacb0e402 100644
--- a/src/IO/AbstractIOHandlerImpl.cpp
+++ b/src/IO/AbstractIOHandlerImpl.cpp
@@ -358,7 +358,11 @@ std::future<void> AbstractIOHandlerImpl::flush()
                 auto &parameter = deref_dynamic_cast<Parameter<O::DEREGISTER>>(
                     i.parameter.get());
                 writeToStderr(
-                    "[", i.writable->parent, "->", i.writable, "] DEREGISTER");
+                    "[",
+                    parameter.former_parent,
+                    "->",
+                    i.writable,
+                    "] DEREGISTER");
                 deregister(i.writable, parameter);
                 break;
             }
diff --git a/src/backend/Writable.cpp b/src/backend/Writable.cpp
index 97d13ce5f0..1762a4cefb 100644
--- a/src/backend/Writable.cpp
+++ b/src/backend/Writable.cpp
@@ -39,7 +39,7 @@ Writable::~Writable()
      * remove references to this object from internal data structures.
      */
     IOHandler->value()->enqueue(
-        IOTask(this, Parameter<Operation::DEREGISTER>()));
+        IOTask(this, Parameter<Operation::DEREGISTER>(parent)));
 }
 
 void Writable::seriesFlush(std::string backendConfig)