diff --git a/Include/pythonrun.h b/Include/pythonrun.h
index bdad15c..fc6c854 100644
--- a/Include/pythonrun.h
+++ b/Include/pythonrun.h
@@ -211,6 +211,7 @@
 PyAPI_FUNC(void) PyFloat_Fini(void);
 PyAPI_FUNC(void) PyOS_FiniInterrupts(void);
 PyAPI_FUNC(void) _PyGC_Fini(void);
+PyAPI_FUNC(void) PySlice_Fini(void);
 
 PyAPI_DATA(PyThreadState *) _Py_Finalizing;
 #endif