diff --git a/Include/cpython/listobject.h b/Include/cpython/listobject.h
index b3b23985de7a66..661610548733fd 100644
--- a/Include/cpython/listobject.h
+++ b/Include/cpython/listobject.h
@@ -21,9 +21,6 @@ typedef struct {
     Py_ssize_t allocated;
 } PyListObject;
 
-PyAPI_FUNC(PyObject *) _PyList_Extend(PyListObject *, PyObject *);
-PyAPI_FUNC(void) _PyList_DebugMallocStats(FILE *out);
-
 /* Cast argument to PyListObject* type. */
 #define _PyList_CAST(op) \
     (assert(PyList_Check(op)), _Py_CAST(PyListObject*, (op)))
diff --git a/Include/internal/pycore_list.h b/Include/internal/pycore_list.h
index b2e503c87542bf..056be2c80c8ce6 100644
--- a/Include/internal/pycore_list.h
+++ b/Include/internal/pycore_list.h
@@ -8,7 +8,9 @@ extern "C" {
 #  error "this header requires Py_BUILD_CORE define"
 #endif
 
-#include "listobject.h"           // _PyList_CAST()
+
+extern PyObject* _PyList_Extend(PyListObject *, PyObject *);
+extern void _PyList_DebugMallocStats(FILE *out);
 
 
 /* runtime lifecycle */