diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index ac223359cad9..c435dfcd540d 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -13,6 +13,10 @@ Next Release (TBD)
 * feature:Parameter Shorthand: Added support for
   ``structure(list-scalar, scalar)`` parameter shorthand.
   (`issue 882 <https://github.com/aws/aws-cli/pull/882>`__)
+* bugfix:``aws s3``: Fix bug when unknown options were
+  passed to ``aws s3`` commands
+  (`issue 886 <https://github.com/aws/aws-cli/pull/886>`__)
+
 
 1.4.2
 =====
diff --git a/awscli/clidriver.py b/awscli/clidriver.py
index 57052006c603..996869098f28 100644
--- a/awscli/clidriver.py
+++ b/awscli/clidriver.py
@@ -194,6 +194,7 @@ def main(self, args=None):
             self._handle_top_level_args(parsed_args)
             return command_table[parsed_args.command](remaining, parsed_args)
         except UnknownArgumentError as e:
+            sys.stderr.write("\n")
             sys.stderr.write(str(e) + '\n')
             return 255
         except NoRegionError as e:
diff --git a/awscli/customizations/commands.py b/awscli/customizations/commands.py
index cb67c6adafa7..0700b7cfe1d2 100644
--- a/awscli/customizations/commands.py
+++ b/awscli/customizations/commands.py
@@ -176,6 +176,8 @@ def __call__(self, args, parsed_globals):
         elif getattr(parsed_args, 'subcommand', None) is None:
             # No subcommand was specified so call the main
             # function for this top level command.
+            if remaining:
+                raise ValueError("Unknown options: %s" % ','.join(remaining))
             return self._run_main(parsed_args, parsed_globals)
         else:
             return subcommand_table[parsed_args.subcommand](remaining,
diff --git a/tests/unit/customizations/s3/test_ls_command.py b/tests/unit/customizations/s3/test_ls_command.py
index 08551dd6b975..b8b5b01fc6fc 100644
--- a/tests/unit/customizations/s3/test_ls_command.py
+++ b/tests/unit/customizations/s3/test_ls_command.py
@@ -14,6 +14,7 @@
 from awscli.testutils import BaseAWSCommandParamsTest
 from dateutil import parser, tz
 
+
 class TestLSCommand(BaseAWSCommandParamsTest):
 
     def test_operations_used_in_recursive_list(self):
@@ -34,6 +35,7 @@ def test_operations_used_in_recursive_list(self):
         self.assertEqual(
             stdout, '%s        100 foo/bar.txt\n'%time_local.strftime('%Y-%m-%d %H:%M:%S'))
 
-
-if __name__ == "__main__":
-    unittest.main()
+    def test_errors_out_with_extra_arguments(self):
+        stderr = self.run_cmd('s3 ls --extra-argument-foo', expected_rc=255)[1]
+        self.assertIn('Unknown options', stderr)
+        self.assertIn('--extra-argument-foo', stderr)