diff --git a/cat_win/tests/test_cat.py b/cat_win/tests/test_cat.py
index 084d6d04..c745c843 100644
--- a/cat_win/tests/test_cat.py
+++ b/cat_win/tests/test_cat.py
@@ -18,6 +18,7 @@
     test_file_content = f.read().split('\n')
 
 
+@patch('cat_win.cat.default_color_dic', dict.fromkeys(cat.color_dic, ''))
 @patch('cat_win.cat.color_dic', dict.fromkeys(cat.color_dic, ''))
 class TestCat(TestCase):
     maxDiff = None
diff --git a/cat_win/tests/test_full.py b/cat_win/tests/test_full.py
index 40ae6271..958698ca 100644
--- a/cat_win/tests/test_full.py
+++ b/cat_win/tests/test_full.py
@@ -21,6 +21,8 @@
 
 
 @patch('cat_win.cat.sys.stdin', StdInMock())
+@patch('cat_win.cat.default_color_dic', dict.fromkeys(cat.color_dic, ''))
+@patch('cat_win.cat.color_dic', dict.fromkeys(cat.color_dic, ''))
 class TestCatFull(TestCase):
     maxDiff = None
 
diff --git a/cat_win/tests/test_shell.py b/cat_win/tests/test_shell.py
index 1fcbaab4..1b3e88a2 100644
--- a/cat_win/tests/test_shell.py
+++ b/cat_win/tests/test_shell.py
@@ -11,6 +11,8 @@
 
 @patch('cat_win.cat.sys.argv', ['<CAT>'])
 @patch('cat_win.cat.stdinhelper.get_stdin_content', stdinhelpermock.get_stdin_content)
+@patch('cat_win.cat.default_color_dic', dict.fromkeys(cat.color_dic, ''))
+@patch('cat_win.cat.color_dic', dict.fromkeys(cat.color_dic, ''))
 class TestShell(TestCase):
     maxDiff = None