diff --git a/Include/internal/pycore_frame.h b/Include/internal/pycore_frame.h
index b6fbc6bc0f7..d164ed7c939 100644
--- a/Include/internal/pycore_frame.h
+++ b/Include/internal/pycore_frame.h
@@ -195,7 +195,7 @@ _PyThreadState_GetFrame(PyThreadState *tstate)
 
 /* For use by _PyFrame_GetFrameObject
   Do not call directly. */
-PyFrameObject *
+PyAPI_FUNC(PyFrameObject *)
 _PyFrame_MakeAndSetFrameObject(_PyInterpreterFrame *frame);
 
 /* Gets the PyFrameObject for this frame, lazily