diff --git a/include/assimp/Importer.hpp b/include/assimp/Importer.hpp
index 1263868bc..9ae8fccc6 100644
--- a/include/assimp/Importer.hpp
+++ b/include/assimp/Importer.hpp
@@ -139,6 +139,11 @@ public:
      */
     Importer(const Importer& other);
 
+    // -------------------------------------------------------------------
+    /** Assignment operator has been deleted
+     */
+    Importer &operator=(const Importer &) = delete;
+
     // -------------------------------------------------------------------
     /** Destructor. The object kept ownership of the imported data,
      * which now will be destroyed along with the object.