diff --git a/Python/pythonrun.c b/Python/pythonrun.c
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -1106,8 +1106,15 @@
 is_valid_fd(int fd)
 {
     int dummy_fd;
+#if defined(HAVE_FSTAT)
+    struct stat buf;
+#endif
     if (fd < 0 || !_PyVerify_fd(fd))
         return 0;
+#if defined(HAVE_FSTAT)
+    if (fstat(fd, &buf) < 0 && errno == EBADF)
+        return 0;
+#endif
     dummy_fd = dup(fd);
     if (dummy_fd < 0)
         return 0;