diff --git a/Include/tupleobject.h b/Include/tupleobject.h
index f17b788..c273ce7 100644
--- a/Include/tupleobject.h
+++ b/Include/tupleobject.h
@@ -63,6 +63,9 @@
 #endif
 
 PyAPI_FUNC(int) PyTuple_ClearFreeList(void);
+#ifndef Py_LIMITED_API
+PyAPI_FUNC(void) _PyTuple_DebugMallocStats(FILE *out);
+#endif /* Py_LIMITED_API */
 
 #ifdef __cplusplus
 }