diff --git a/Include/objimpl.h b/Include/objimpl.h
index 1408d05..689c42b 100644
--- a/Include/objimpl.h
+++ b/Include/objimpl.h
@@ -150,8 +150,12 @@ PyAPI_FUNC(PyVarObject *) _PyObject_NewVar(PyTypeObject *, Py_ssize_t);
  * ==========================
  */
 
-/* C equivalent of gc.collect() which ignores the state of gc.enabled. */
+/* C equivalent of gc.collect(). */
 PyAPI_FUNC(Py_ssize_t) PyGC_Collect(void);
+/* C API for controlling the state of the garbage collector */
+PyAPI_FUNC(int) PyGC_Enable(void);
+PyAPI_FUNC(int) PyGC_Disable(void);
+PyAPI_FUNC(int) PyGC_IsEnabled(void);
 
 /* Test if a type has a GC head */
 #define PyType_IS_GC(t) PyType_HasFeature((t), Py_TPFLAGS_HAVE_GC)