diff --git a/python/lsst/daf/butler/butler.py b/python/lsst/daf/butler/butler.py
index e1f13d1d9b..b69dd0f3cf 100644
--- a/python/lsst/daf/butler/butler.py
+++ b/python/lsst/daf/butler/butler.py
@@ -24,7 +24,6 @@
 from .core.config import Config
 from .core.datastore import Datastore
 from .core.registry import Registry
-from .core.datasets import DatasetRef
 
 
 class ButlerConfig(Config):
diff --git a/python/lsst/daf/butler/core/fileDescriptor.py b/python/lsst/daf/butler/core/fileDescriptor.py
index 21caac41ab..34b1bc726b 100644
--- a/python/lsst/daf/butler/core/fileDescriptor.py
+++ b/python/lsst/daf/butler/core/fileDescriptor.py
@@ -21,6 +21,7 @@
 # see <https://www.lsstcorp.org/LegalNotices/>.
 #
 
+
 class FileDescriptor(object):
     """Describes a particular file.
 
diff --git a/python/lsst/daf/butler/core/quantum.py b/python/lsst/daf/butler/core/quantum.py
index b220af365c..a93a3dfe61 100644
--- a/python/lsst/daf/butler/core/quantum.py
+++ b/python/lsst/daf/butler/core/quantum.py
@@ -21,9 +21,6 @@
 # see <https://www.lsstcorp.org/LegalNotices/>.
 #
 
-from .datasets import DatasetRef
-from .run import Run
-
 
 class Quantum(object):
     """A discrete unit of work that may depend on one or more Datasets and produces one or more `Dataset`s.