diff --git a/Python/pythonrun.c b/Python/pythonrun.c
index 522a05d8b4d..375bf34c82d 100644
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -821,7 +821,7 @@ Py_GetProgramName(void)
 }
 
 static wchar_t *default_home = NULL;
-static wchar_t env_home[PATH_MAX+1];
+static wchar_t env_home[MAXPATHLEN+1];
 
 void
 Py_SetPythonHome(wchar_t *home)