diff --git a/Include/pylifecycle.h b/Include/pylifecycle.h
index 5423060..17ed110 100644
--- a/Include/pylifecycle.h
+++ b/Include/pylifecycle.h
@@ -105,6 +105,7 @@
 #ifdef Py_BUILD_CORE
 PyAPI_FUNC(_PyInitError) _PyPathConfig_Init(
     const _PyMainInterpreterConfig *main_config);
+PyAPI_FUNC(PyObject*) _PyPathConfig_ComputeArgv0(int argc, wchar_t **argv);
 #endif
 PyAPI_FUNC(void)      Py_SetPath(const wchar_t *);
 #ifdef MS_WINDOWS
diff --git a/Include/sysmodule.h b/Include/sysmodule.h
index b709629..719ecfc 100644
--- a/Include/sysmodule.h
+++ b/Include/sysmodule.h
@@ -16,12 +16,6 @@
 
 PyAPI_FUNC(void) PySys_SetArgv(int, wchar_t **);
 PyAPI_FUNC(void) PySys_SetArgvEx(int, wchar_t **, int);
-#ifdef Py_BUILD_CORE
-PyAPI_FUNC(_PyInitError) _PySys_SetArgvWithError(
-    int argc,
-    wchar_t **argv,
-    int updatepath);
-#endif
 PyAPI_FUNC(void) PySys_SetPath(const wchar_t *);
 
 PyAPI_FUNC(void) PySys_WriteStdout(const char *format, ...)