diff --git a/Include/pythonrun.h b/Include/pythonrun.h
index e309078..6cf33d8 100644
--- a/Include/pythonrun.h
+++ b/Include/pythonrun.h
@@ -108,6 +108,7 @@
 PyAPI_FUNC(const char *) Py_GetCopyright(void);
 PyAPI_FUNC(const char *) Py_GetCompiler(void);
 PyAPI_FUNC(const char *) Py_GetBuildInfo(void);
+PyAPI_FUNC(const char *) Py_GetBuildNumber(void);
 
 /* Internal -- various one-time initializations */
 PyAPI_FUNC(PyObject *) _PyBuiltin_Init(void);