diff --git a/src/core/domain/system.cpp b/src/core/domain/system.cpp
index bb95e16..3487d33 100644
--- a/src/core/domain/system.cpp
+++ b/src/core/domain/system.cpp
@@ -46,8 +46,11 @@ void System::Load(std::string module_name, std::string file_name, ImportType typ
         throw std::runtime_error("cannot open file: " + file_name);
     }
 
-    // Creation or retrieval of the module, then parse into it.
+    // Creation or retrieval of the module, then parse into it. add() copies the
+    // Part pointers into the module, which takes ownership; deleting the
+    // importer then frees the (now drained) Parts container, not the parts.
     Module *mod = mods->merge(module_name);
     imp->parse(mod->signals);
     mod->add(imp->parts());
+    delete imp;
 }
\ No newline at end of file
diff --git a/src/core/imports/import_base.hpp b/src/core/imports/import_base.hpp
index 04a1c28..205feb9 100644
--- a/src/core/imports/import_base.hpp
+++ b/src/core/imports/import_base.hpp
@@ -64,9 +64,13 @@ public:
     /**
      * @brief Virtual destructor for ImportBase.
      *
-     * Ensures proper cleanup of derived classes.
+     * Frees the Parts container object. Only the container is deleted, not the
+     * Part objects it holds: by the time the importer is destroyed those have
+     * been transferred to a Module (SystemElementContainer::add copies the
+     * pointers), which owns and deletes them. The default ~Parts frees the map
+     * without touching the elements, so there is no double free.
      */
-    virtual ~ImportBase() = default;
+    virtual ~ImportBase() { delete prts; }
 };
 
 #endif // _IMPORT_BASE_HPP_
\ No newline at end of file
diff --git a/src/core/imports/import_mentor.cpp b/src/core/imports/import_mentor.cpp
index 5795c4c..2bce6e4 100644
--- a/src/core/imports/import_mentor.cpp
+++ b/src/core/imports/import_mentor.cpp
@@ -43,16 +43,6 @@ enum class State
  */
 ImportMentor::ImportMentor(string filename) : ImportBase(filename) {}
 
-/**
- * @brief Destructor for ImportMentor.
- *
- * Ensures proper cleanup by calling the base class destructor.
- */
-ImportMentor::~ImportMentor()
-{
-    ImportBase::~ImportBase();
-}
-
 /**
  * @brief Parses the file to extract parts, pins, and signals.
  *
diff --git a/src/core/imports/import_mentor.hpp b/src/core/imports/import_mentor.hpp
index 0b0f143..00029f5 100644
--- a/src/core/imports/import_mentor.hpp
+++ b/src/core/imports/import_mentor.hpp
@@ -10,7 +10,6 @@ class ImportMentor : public ImportBase
 public:
     ImportMentor(std::string filename);
     void parse(Signals *signals) override;
-    ~ImportMentor();
 };
 
 #endif // _IMPORT_MENTOR_HPP_
\ No newline at end of file