diff --git a/libpyclingo/pyclingo.cc b/libpyclingo/pyclingo.cc
index 9480203..6a7068c 100644
--- a/libpyclingo/pyclingo.cc
+++ b/libpyclingo/pyclingo.cc
@@ -1177,7 +1177,7 @@ PyTypeObject ObjectBase<T>::type = {
     sizeof(T),                                  // tp_basicsize
     0,                                          // tp_itemsize
     PythonDetail::Get_tp_dealloc<T>::value,     // tp_dealloc
-    nullptr,                                    // tp_print
+    0,                                          // tp_print
     nullptr,                                    // tp_getattr
     nullptr,                                    // tp_setattr
     nullptr,                                    // tp_compare