diff --git a/Include/ceval.h b/Include/ceval.h
index d3292b8e2c7..7dfe2b254e9 100644
--- a/Include/ceval.h
+++ b/Include/ceval.h
@@ -24,7 +24,7 @@ PyAPI_FUNC(PyObject *) PyEval_CallMethod(PyObject *obj,
 PyAPI_FUNC(void) PyEval_SetProfile(Py_tracefunc, PyObject *);
 PyAPI_FUNC(void) PyEval_SetTrace(Py_tracefunc, PyObject *);
 PyAPI_FUNC(void) PyEval_SetCoroutineWrapper(PyObject *wrapper);
-PyAPI_FUNC(PyObject *) PyEval_GetCoroutineWrapper();
+PyAPI_FUNC(PyObject *) PyEval_GetCoroutineWrapper(void);
 #endif
 
 struct _frame; /* Avoid including frameobject.h */
diff --git a/Python/ceval.c b/Python/ceval.c
index 8acd08201e5..77085c25a03 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -4414,7 +4414,7 @@ PyEval_SetCoroutineWrapper(PyObject *wrapper)
 }
 
 PyObject *
-PyEval_GetCoroutineWrapper()
+PyEval_GetCoroutineWrapper(void)
 {
     PyThreadState *tstate = PyThreadState_GET();
     return tstate->coroutine_wrapper;