diff --git a/dvc/cli.py b/dvc/cli.py
index cf96ab7a9..c2564be1c 100644
--- a/dvc/cli.py
+++ b/dvc/cli.py
@@ -1,5 +1,6 @@
 from __future__ import print_function
 
+import sys
 import argparse
 from multiprocessing import cpu_count
 
@@ -7,7 +8,7 @@ from dvc.command.init import CmdInit
 from dvc.command.remove import CmdRemove
 from dvc.command.run import CmdRun
 from dvc.command.repro import CmdRepro
-from dvc.command.data_sync import CmdDataSync, CmdDataPush, CmdDataPull, CmdDataStatus
+from dvc.command.data_sync import CmdDataPush, CmdDataPull, CmdDataStatus
 from dvc.command.lock import CmdLock
 from dvc.command.gc import CmdGC
 from dvc.command.import_file import CmdImportFile
@@ -55,6 +56,11 @@ def parse_args(argv=None):
                         dest='cmd',
                         help='Use dvc CMD --help for command-specific help')
 
+    # NOTE: Workaround for bug in Python 3
+    if sys.version_info[0] == 3:
+        subparsers.required = True
+        subparsers.dest = 'cmd'
+
     # Init
     init_parser = subparsers.add_parser(
                         'init',
@@ -122,13 +128,6 @@ def parse_args(argv=None):
                         default=cpu_count(),
                         help='Number of jobs to run simultaneously.')
 
-    # Sync
-    sync_parser = subparsers.add_parser(
-                        'sync',
-                        parents=[parent_sync_parser],
-                        help='Synchronize data file with cloud (cloud settings already setup.')
-    sync_parser.set_defaults(func=CmdDataSync)
-
     # Pull
     pull_parser = subparsers.add_parser(
                         'pull',
diff --git a/dvc/command/data_sync.py b/dvc/command/data_sync.py
index dff434da0..8513b74de 100644
--- a/dvc/command/data_sync.py
+++ b/dvc/command/data_sync.py
@@ -3,14 +3,6 @@ from dvc.logger import Logger
 
 import dvc.data_cloud as cloud
 
-class CmdDataSync(CmdBase):
-    def __init__(self, settings):
-        super(CmdDataSync, self).__init__(settings)
-
-    def run(self):
-        with DvcLock(self.is_locker, self.git):
-            self.cloud.sync(self.parsed_args.targets, self.parsed_args.jobs)
-
 
 class CmdDataPull(CmdBase):
     def __init__(self, settings):