1 files changed, 3 insertions, 2 deletions
diff --git a/Objects/interpreteridobject.c b/Objects/interpreteridobject.c
index 57748e8139..3f316873ed 100644
--- a/Objects/interpreteridobject.c
+++ b/Objects/interpreteridobject.c
@@ -1,7 +1,8 @@
 /* InterpreterID object */
 
 #include "Python.h"
-#include "internal/pycore_pystate.h"
+#include "pycore_abstract.h"   // _PyIndex_Check()
+#include "pycore_pystate.h"
 #include "interpreteridobject.h"
 
 
@@ -42,7 +43,7 @@ interp_id_converter(PyObject *arg, void *ptr)
     if (PyObject_TypeCheck(arg, &_PyInterpreterID_Type)) {
         id = ((interpid *)arg)->id;
     }
-    else if (PyIndex_Check(arg)) {
+    else if (_PyIndex_Check(arg)) {
         id = PyLong_AsLongLong(arg);
         if (id == -1 && PyErr_Occurred()) {
             return 0;