diff --git a/ckanext/cloudstorage/storage.py b/ckanext/cloudstorage/storage.py
index 56da0c9..18ced84 100644
--- a/ckanext/cloudstorage/storage.py
+++ b/ckanext/cloudstorage/storage.py
@@ -279,7 +279,7 @@ def upload(self, id, max_size=10):
                     print(traceback.format_exc())
                     raise v
                 except types.InvalidCredsError as err:
-                    print('EXCEPTION: {0}'.format(err))
+                    print(traceback.format_exc())
                     raise err
 
         elif self._clear and self.old_filename and not self.leave_files: