diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index 112279ed7..d1eca3760 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -1837,6 +1837,12 @@ def write_json_file(obj, fn):
                 os.unlink(fn)
             except OSError:
                 pass
+        try:
+            mask = os.umask(0)
+            os.umask(mask)
+            os.chmod(tf.name, 0o666 & ~mask)
+        except OSError:
+            pass
         os.rename(tf.name, fn)
     except Exception:
         try: