diff --git a/glymur/jp2box.py b/glymur/jp2box.py
index 4a390a5..e29df28 100644
--- a/glymur/jp2box.py
+++ b/glymur/jp2box.py
@@ -35,11 +35,12 @@ from .core import (_COLORSPACE_MAP_DISPLAY, _COLOR_TYPE_MAP_DISPLAY,
 
 from . import _uuid_io
 
-_METHOD_DISPLAY = {
-    ENUMERATED_COLORSPACE: 'enumerated colorspace',
-    RESTRICTED_ICC_PROFILE: 'restricted ICC profile',
-    ANY_ICC_PROFILE: 'any ICC profile',
-    VENDOR_COLOR_METHOD: 'vendor color method'}
+_factory = lambda x: '{0} (invalid)'.format(x)
+_keysvalues = {ENUMERATED_COLORSPACE: 'enumerated colorspace',
+               RESTRICTED_ICC_PROFILE: 'restricted ICC profile',
+               ANY_ICC_PROFILE: 'any ICC profile',
+               VENDOR_COLOR_METHOD: 'vendor color method'}
+_METHOD_DISPLAY = _Keydefaultdict(_factory, _keysvalues)
 
 _factory = lambda x: '{0} (invalid)'.format(x)
 _keysvalues = {1: 'accurately represents correct colorspace definition',
@@ -1317,7 +1318,13 @@ class FileTypeBox(Jp2kBox):
         for j in range(int(num_entries)):
             entry, = struct.unpack_from('>4s', read_buffer, 8 + j * 4)
             if sys.hexversion >= 0x03000000:
-                entry = entry.decode('utf-8')
+                try:
+                    entry = entry.decode('utf-8')
+                except UnicodeDecodeError as err:
+                    # The entry is invalid, but we've got code to catch this
+                    # later on.
+                    pass
+
             compatibility_list.append(entry)
 
         return cls(brand=brand, minor_version=minor_version,
diff --git a/glymur/test/test_jp2k.py b/glymur/test/test_jp2k.py
index 4dc4df4..4bc928b 100644
--- a/glymur/test/test_jp2k.py
+++ b/glymur/test/test_jp2k.py
@@ -272,6 +272,15 @@ class TestJp2k(unittest.TestCase):
         jp2 = Jp2k(jfile)
         self.assertEqual(jp2.shape, (128, 128))
 
+    @unittest.skipIf(OPJ_DATA_ROOT is None,
+                     "OPJ_DATA_ROOT environment variable not set")
+    def test_invalid_compatibility_list_entry(self):
+        """should not error out with invalid compatibility list entry"""
+        filename = opj_data_file('input/nonregression/issue397.jp2')
+        with self.assertWarns(UserWarning):
+            Jp2k(filename)
+        self.assertTrue(True)
+
     def test_shape_j2k(self):
         """verify shape attribute for J2K file
         """
diff --git a/glymur/test/test_opj_suite_dump.py b/glymur/test/test_opj_suite_dump.py
index f13b128..844ce9c 100644
--- a/glymur/test/test_opj_suite_dump.py
+++ b/glymur/test/test_opj_suite_dump.py
@@ -3,7 +3,6 @@ The tests defined here roughly correspond to what is in the OpenJPEG test
 suite.
 """
 import re
-import sys
 import unittest
 
 import numpy as np
diff --git a/glymur/test/test_printing.py b/glymur/test/test_printing.py
index f9fcd73..49fec57 100644
--- a/glymur/test/test_printing.py
+++ b/glymur/test/test_printing.py
@@ -831,6 +831,17 @@ class TestPrintingOpjDataRootWarns(unittest.TestCase):
     def tearDown(self):
         pass
 
+    def test_invalid_colour_specification_method(self):
+        """should not error out with invalid colour specification method"""
+        # Don't care so much about what the output looks like, just that we
+        # do not error out.
+        filename = opj_data_file('input/nonregression/issue397.jp2')
+        with self.assertWarns(UserWarning):
+            jp2 = Jp2k(filename)
+        with patch('sys.stdout', new=StringIO()):
+            print(jp2)
+        self.assertTrue(True)
+
     def test_invalid_colorspace(self):
         """An invalid colorspace shouldn't cause an error."""
         filename = opj_data_file('input/nonregression/edf_c2_1103421.jp2')