diff --git a/src/qhull_wrap.cpp b/src/qhull_wrap.cpp
index f219f88b4b14..cdebaf730493 100644
--- a/src/qhull_wrap.cpp
+++ b/src/qhull_wrap.cpp
@@ -295,14 +295,14 @@ delaunay(PyObject *self, PyObject *args)
 
 /* Return qhull version string for assistance in debugging. */
 static PyObject*
-version(void)
+version(PyObject *self, PyObject *arg)
 {
     return PyBytes_FromString(qh_version);
 }
 
 static PyMethodDef qhull_methods[] = {
-    {"delaunay", (PyCFunction)delaunay, METH_VARARGS, ""},
-    {"version", (PyCFunction)version, METH_NOARGS, ""},
+    {"delaunay", delaunay, METH_VARARGS, ""},
+    {"version", version, METH_NOARGS, ""},
     {NULL, NULL, 0, NULL}
 };