diff --git a/Lib/python/pytypemaps.swg b/Lib/python/pytypemaps.swg
index 777a2fb42..58dc067ab 100644
--- a/Lib/python/pytypemaps.swg
+++ b/Lib/python/pytypemaps.swg
@@ -53,7 +53,7 @@
 /* set constant */
 %define %set_constant(name, obj) %begin_block
   PyObject *_obj = obj; 
-  PyDict_SetItemString(d, name, _obj); 
+  PyDict_SetItemString(d, (char*) name, _obj); 
   Py_DECREF(_obj);
 %end_block %enddef