diff --git a/CHANGELOG.md b/CHANGELOG.md
index bbdd695..eb96b4e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Fixed
+
+- Short options immediately followed by a value weren't parsed correctly. Fixes #84.
+
 ## [0.16.1] - 2018-06-04
 
 ### Fixed
diff --git a/next_action/arguments/parser.py b/next_action/arguments/parser.py
index 725d787..0d7a4b1 100644
--- a/next_action/arguments/parser.py
+++ b/next_action/arguments/parser.py
@@ -153,7 +153,8 @@ class NextActionArgumentParser(argparse.ArgumentParser):
     @staticmethod
     def arguments_not_specified(*arguments: str) -> bool:
         """ Return whether any of the arguments was specified on the command line. """
-        return all([argument not in sys.argv for argument in arguments])
+        return not any([command_line_arg.startswith(argument) for argument in arguments
+                        for command_line_arg in sys.argv])
 
     def fix_filenames(self, namespace: argparse.Namespace) -> None:
         """ Fix the filenames. """

diff --git a/tests/unittests/arguments/test_config.py b/tests/unittests/arguments/test_config.py
index 8eb5728..12e9a15 100644
--- a/tests/unittests/arguments/test_config.py
+++ b/tests/unittests/arguments/test_config.py
@@ -270,13 +270,19 @@ class PriorityTest(ConfigTestCase):
     @patch.object(sys, "argv", ["next-action", "--priority", "M"])
     @patch.object(config, "open", mock_open(read_data="priority: Z"))
     def test_override_priority(self):
-        """ Test that a command line style overrides the priority in the config file. """
+        """ Test that a command line option overrides the priority in the config file. """
+        self.assertEqual("M", parse_arguments()[1].priority)
+
+    @patch.object(sys, "argv", ["next-action", "-pM"])
+    @patch.object(config, "open", mock_open(read_data="priority: Z"))
+    def test_override_short(self):
+        """ Test that a short command line option overrides the priority in the config file. """
         self.assertEqual("M", parse_arguments()[1].priority)
 
     @patch.object(sys, "argv", ["next-action", "--priority"])
     @patch.object(config, "open", mock_open(read_data="priority: Z"))
     def test_cancel_priority(self):
-        """ Test that a command line style overrides the priority in the config file. """
+        """ Test that a command line option overrides the priority in the config file. """
         self.assertEqual(None, parse_arguments()[1].priority)
 
     @patch.object(sys, "argv", ["next-action"])

next-action -pA isn't interpreted as next-action -p A
tests/unittests/arguments/test_config.py::PriorityTest::test_override_short
tests/unittests/arguments/test_config.py::ConfigFileTest::test_empty_file tests/unittests/arguments/test_config.py::ConfigFileTest::test_error_opening tests/unittests/arguments/test_config.py::ConfigFileTest::test_error_parsing tests/unittests/arguments/test_config.py::ConfigFileTest::test_file_not_found tests/unittests/arguments/test_config.py::ConfigFileTest::test_invalid_document tests/unittests/arguments/test_config.py::ConfigFileTest::test_missing_default_config tests/unittests/arguments/test_config.py::ConfigFileTest::test_no_file_key tests/unittests/arguments/test_config.py::ConfigFileTest::test_skip_config tests/unittests/arguments/test_config.py::ConfigFileTest::test_write_config tests/unittests/arguments/test_config.py::FilenameTest::test_cli_takes_precedence tests/unittests/arguments/test_config.py::FilenameTest::test_invalid_filename tests/unittests/arguments/test_config.py::FilenameTest::test_valid_and_invalid tests/unittests/arguments/test_config.py::FilenameTest::test_valid_file tests/unittests/arguments/test_config.py::FilenameTest::test_valid_files tests/unittests/arguments/test_config.py::NumberTest::test_all_and_number tests/unittests/arguments/test_config.py::NumberTest::test_all_false tests/unittests/arguments/test_config.py::NumberTest::test_all_true tests/unittests/arguments/test_config.py::NumberTest::test_argument_all_overrides tests/unittests/arguments/test_config.py::NumberTest::test_argument_nr_overrides tests/unittests/arguments/test_config.py::NumberTest::test_cli_takes_precedence tests/unittests/arguments/test_config.py::NumberTest::test_invalid_number tests/unittests/arguments/test_config.py::NumberTest::test_valid_number tests/unittests/arguments/test_config.py::NumberTest::test_zero tests/unittests/arguments/test_config.py::ConfigStyleTest::test_cancel_style tests/unittests/arguments/test_config.py::ConfigStyleTest::test_invalid_style tests/unittests/arguments/test_config.py::ConfigStyleTest::test_override_style tests/unittests/arguments/test_config.py::ConfigStyleTest::test_valid_style tests/unittests/arguments/test_config.py::PriorityTest::test_cancel_priority tests/unittests/arguments/test_config.py::PriorityTest::test_invalid_priority tests/unittests/arguments/test_config.py::PriorityTest::test_override_priority tests/unittests/arguments/test_config.py::PriorityTest::test_valid_priority tests/unittests/arguments/test_config.py::ReferenceTest::test_invalid_priority tests/unittests/arguments/test_config.py::ReferenceTest::test_override tests/unittests/arguments/test_config.py::ReferenceTest::test_valid_reference