diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -2320,12 +2320,12 @@ posix_lchown(PyObject *self, PyObject *a
 static PyObject *
 posix_getcwd(int use_bytes)
 {
-    char buf[1026];
+    char buf[MAXPATHLEN];
     char *res;
 
 #ifdef MS_WINDOWS
     if (!use_bytes) {
-        wchar_t wbuf[1026];
+        wchar_t wbuf[MAXPATHLEN];
         wchar_t *wbuf2 = wbuf;
         PyObject *resobj;
         DWORD len;