diff --git a/bindings/pyroot_experimental/PyROOT/src/CppCallablePyz.cxx b/bindings/pyroot_experimental/PyROOT/src/CppCallablePyz.cxx
index 5a2bb0b8d8e8f2afd77bda445ec01e43eeb944e5..00fe6cdea4d8a5be182b90e0501556d529ce1f62 100644
--- a/bindings/pyroot_experimental/PyROOT/src/CppCallablePyz.cxx
+++ b/bindings/pyroot_experimental/PyROOT/src/CppCallablePyz.cxx
@@ -692,7 +692,7 @@ static PyMethodDef CallableImplMethods[] =
 {
     {"__init__", (PyCFunction)GenericCallableImpl_init, METH_VARARGS|METH_KEYWORDS, "Parse decorator arguments"},
     {"__call__", ProxyCallableImpl_call, METH_VARARGS, "Create C++ wrapper function"},
-    {NULL},
+    {NULL, NULL, 0, NULL}
 };