diff --git a/newsfragments/3501.minor b/newsfragments/3501.minor
new file mode 100644
index 000000000..e69de29bb
diff --git a/src/allmydata/mutable/checker.py b/src/allmydata/mutable/checker.py
index 56b8fb2cc..e3e5951f0 100644
--- a/src/allmydata/mutable/checker.py
+++ b/src/allmydata/mutable/checker.py
@@ -1,3 +1,14 @@
+"""
+Ported to Python 3.
+"""
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+from future.utils import PY2
+if PY2:
+    from future.builtins import filter, map, zip, ascii, chr, hex, input, next, oct, open, pow, round, super, bytes, dict, list, object, range, str, max, min  # noqa: F401
 
 from allmydata.uri import from_string
 from allmydata.util import base32, log, dictutil
diff --git a/src/allmydata/mutable/common.py b/src/allmydata/mutable/common.py
index 16f39b302..802681ae7 100644
--- a/src/allmydata/mutable/common.py
+++ b/src/allmydata/mutable/common.py
@@ -1,3 +1,14 @@
+"""
+Ported to Python 3.
+"""
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+from future.utils import PY2
+if PY2:
+    from future.builtins import filter, map, zip, ascii, chr, hex, input, next, oct, open, pow, round, super, bytes, dict, list, object, range, str, max, min  # noqa: F401
 
 MODE_CHECK = "MODE_CHECK" # query all peers
 MODE_ANYTHING = "MODE_ANYTHING" # one recoverable version
diff --git a/src/allmydata/mutable/filenode.py b/src/allmydata/mutable/filenode.py
index cebc0ded0..5afc84dec 100644
--- a/src/allmydata/mutable/filenode.py
+++ b/src/allmydata/mutable/filenode.py
@@ -1,3 +1,15 @@
+"""
+Ported to Python 3.
+"""
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+from future.utils import PY2
+if PY2:
+    from future.builtins import filter, map, zip, ascii, chr, hex, input, next, oct, open, pow, round, super, bytes, dict, list, object, range, str, max, min  # noqa: F401
+
 import random
 
 from zope.interface import implementer
@@ -1141,7 +1153,7 @@ class MutableFileVersion(object):
         start_segments = {} # shnum -> start segment
         end_segments = {} # shnum -> end segment
         blockhashes = {} # shnum -> blockhash tree
-        for (shnum, original_data) in update_data.items():
+        for (shnum, original_data) in list(update_data.items()):
             data = [d[1] for d in original_data if d[0] == self._version]
             # data is [(blockhashes,start,end)..]
 
diff --git a/src/allmydata/mutable/publish.py b/src/allmydata/mutable/publish.py
index 7ff784528..17b73685e 100644
--- a/src/allmydata/mutable/publish.py
+++ b/src/allmydata/mutable/publish.py
@@ -1,3 +1,15 @@
+"""
+Ported to Python 3.
+"""
+from __future__ import division
+from __future__ import absolute_import
+from __future__ import print_function
+from __future__ import unicode_literals
+
+from future.utils import PY2
+if PY2:
+    from future.builtins import filter, map, zip, ascii, chr, hex, input, next, oct, open, pow, round, super, bytes, dict, list, object, range, str, max, min  # noqa: F401
+
 import os, time
 from io import BytesIO
 from itertools import count
@@ -446,7 +458,7 @@ class Publish(object):
 
         # then we add in all the shares that were bad (corrupted, bad
         # signatures, etc). We want to replace these.
-        for key, old_checkstring in self._servermap.get_bad_shares().items():
+        for key, old_checkstring in list(self._servermap.get_bad_shares().items()):
             (server, shnum) = key
             self.goal.add( (server,shnum) )
             self.bad_share_checkstrings[(server,shnum)] = old_checkstring
@@ -1105,7 +1117,7 @@ class Publish(object):
             self.bad_servers.add(server) # don't ask them again
             # use the checkstring to add information to the log message
             unknown_format = False
-            for (shnum,readv) in read_data.items():
+            for (shnum,readv) in list(read_data.items()):
                 checkstring = readv[0]
                 version = get_version_from_checkstring(checkstring)
                 if version == MDMF_VERSION:
diff --git a/src/allmydata/util/_python3.py b/src/allmydata/util/_python3.py
index fe43692fb..7afefceed 100644
--- a/src/allmydata/util/_python3.py
+++ b/src/allmydata/util/_python3.py
@@ -53,6 +53,10 @@ PORTED_MODULES = [
     "allmydata.interfaces",
     "allmydata.introducer.interfaces",
     "allmydata.monitor",
+    "allmydata.mutable.checker",
+    "allmydata.mutable.common",
+    "allmydata.mutable.filenode",
+    "allmydata.mutable.publish",
     "allmydata.node",
     "allmydata.storage_client",
     "allmydata.storage.common",