diff --git a/astroquery/mast/missions.py b/astroquery/mast/missions.py
index d74e9fa9dc..b29f8f466a 100644
--- a/astroquery/mast/missions.py
+++ b/astroquery/mast/missions.py
@@ -7,12 +7,13 @@
 """
 
 import difflib
+from json import JSONDecodeError
 import warnings
 
 from astropy.table import Table
 import astropy.units as u
 import astropy.coordinates as coord
-from requests import JSONDecodeError, RequestException
+from requests import RequestException
 
 from astroquery.utils import commons, async_to_sync
 from astroquery.utils.class_or_instance import class_or_instance