diff --git a/CMakeLists.txt b/CMakeLists.txt
index 133f9f82e340801195d711d9f946dc59be64ee1a..c45fa58f30481fdfd5bbed84031370313a36c5f5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -128,6 +128,7 @@ SET(${PROJECT_NAME}_HEADERS
   include/eigenpy/ufunc.hpp
   include/eigenpy/register.hpp
   include/eigenpy/stride.hpp
+  include/eigenpy/swig.hpp
   include/eigenpy/version.hpp
 )
 
diff --git a/include/eigenpy/swig.hpp b/include/eigenpy/swig.hpp
new file mode 100644
index 0000000000000000000000000000000000000000..0913ce66620e38e2b0d9834fd8ccd6c4859a6b63
--- /dev/null
+++ b/include/eigenpy/swig.hpp
@@ -0,0 +1,33 @@
+//
+// Copyright (c) 2020 INRIA
+//
+
+#ifndef __eigenpy_swig_hpp__
+#define __eigenpy_swig_hpp__
+
+#include "eigenpy/fwd.hpp"
+
+namespace eigenpy
+{
+  struct PySwigObject
+  {
+    PyObject_HEAD
+    void * ptr;
+    const char * desc;
+  };
+
+  inline PySwigObject * get_PySwigObject(PyObject * pyObj)
+  {
+    if(!PyObject_HasAttrString(pyObj,"this"))
+      return NULL;
+    
+    PyObject * this_ptr = PyObject_GetAttrString(pyObj,"this");
+    if(this_ptr == NULL)
+      return NULL;
+    PySwigObject * swig_obj = reinterpret_cast<PySwigObject*>(this_ptr);
+    
+    return swig_obj;
+  }
+}
+
+#endif // ifndef __eigenpy_swig_hpp__