diff --git a/mat2 b/mat2
index c7f7a733f20a95b3bbea3079d407d84f65e059db..2a8ef46f8a031668d331946731e3478415faa114 100755
--- a/mat2
+++ b/mat2
@@ -37,11 +37,11 @@ def create_arg_parser():
                         version='MAT2 %s' % __version__)
     parser.add_argument('-l', '--list', action='store_true',
                         help='list all supported fileformats')
-    parser.add_argument('-c', '--check-dependencies', action='store_true',
+    parser.add_argument('--check-dependencies', action='store_true',
                         help='check if MAT2 has all the dependencies it needs')
     parser.add_argument('-V', '--verbose', action='store_true',
                         help='show more verbose status information')
-    parser.add_argument('-u', '--unknown-members', metavar='policy', default='abort',
+    parser.add_argument('--unknown-members', metavar='policy', default='abort',
                         help='how to handle unknown members of archive-style files ' +
                         '(policy should be abort, omit, or keep)')
 
diff --git a/tests/test_climat2.py b/tests/test_climat2.py
index 9614347b7d234dd100f5b815f0652f757ffae025..7d12a0364beedbf953e9b69569510576bd44a369 100644
--- a/tests/test_climat2.py
+++ b/tests/test_climat2.py
@@ -8,14 +8,16 @@ class TestHelp(unittest.TestCase):
     def test_help(self):
         proc = subprocess.Popen(['./mat2', '--help'], stdout=subprocess.PIPE)
         stdout, _ = proc.communicate()
-        self.assertIn(b'usage: mat2 [-h] [-v] [-l] [-c] [-V] [-u policy] [-s | -L] [files [files ...]]',
+        self.assertIn(b'usage: mat2 [-h] [-v] [-l] [--check-dependencies] [-V]',
                       stdout)
+        self.assertIn(b'[--unknown-members policy] [-s | -L]', stdout)
 
     def test_no_arg(self):
         proc = subprocess.Popen(['./mat2'], stdout=subprocess.PIPE)
         stdout, _ = proc.communicate()
-        self.assertIn(b'usage: mat2 [-h] [-v] [-l] [-c] [-V] [-u policy] [-s | -L] [files [files ...]]',
+        self.assertIn(b'usage: mat2 [-h] [-v] [-l] [--check-dependencies] [-V]',
                       stdout)
+        self.assertIn(b'[--unknown-members policy] [-s | -L]', stdout)
 
 
 class TestVersion(unittest.TestCase):