diff --git a/django_migration_linter/cache.py b/django_migration_linter/cache.py
index 46e3a63..ca03b2d 100644
--- a/django_migration_linter/cache.py
+++ b/django_migration_linter/cache.py
@@ -41,6 +41,7 @@ class Cache(dict):
             pass
 
     def save(self):
+        print(self)
         f = open(self.filename, 'wb')
         pickle.dump(self, f, 2)
         f.close()
diff --git a/django_migration_linter/migration_linter.py b/django_migration_linter/migration_linter.py
index a04f5a2..1614f8a 100644
--- a/django_migration_linter/migration_linter.py
+++ b/django_migration_linter/migration_linter.py
@@ -103,6 +103,7 @@ class MigrationLinter(object):
 
         if analysis_result['ignored']:
             print('IGNORE')
+            self.new_cache[md5hash] = {'result': 'IGNORE'}
             self.nb_ignored += 1
             return
 
diff --git a/tests/functional/test_cache.py b/tests/functional/test_cache.py
index 4ea631f..7c68ed4 100644
--- a/tests/functional/test_cache.py
+++ b/tests/functional/test_cache.py
@@ -28,7 +28,6 @@ else:
     import mock
 
 
-
 class CacheTest(unittest.TestCase):
     MIGRATION_FILE = os.path.join(fixtures.ALTER_COLUMN_PROJECT, 'test_app', 'migrations', '0001_initial.py')
     fd, temp_path = tempfile.mkstemp()
@@ -73,7 +72,30 @@ class CacheTest(unittest.TestCase):
         self.assertTrue(linter.has_errors)
 
     def test_cache_ignored(self):
-        pass
+        cache_file = os.path.join(DEFAULT_CACHE_PATH, 'test_project_ignore_migration.pickle')
+        if os.path.exists(cache_file):
+            os.remove(cache_file)
+        linter = MigrationLinter(fixtures.IGNORE_MIGRATION_PROJECT)
+
+        with mock.patch.object(MigrationLinter, 'get_sql', wraps=linter.get_sql)as sql_mock:
+            linter.lint_all_migrations()
+            sql_mock.assert_called()
+
+        cache = Cache(
+            fixtures.IGNORE_MIGRATION_PROJECT,
+            DEFAULT_CACHE_PATH
+        )
+        cache.load()
+
+        self.assertEqual(cache['63230606af0eccaef7f1f78c537c624c']['result'], 'OK')
+        self.assertEqual(cache['5c5ca1780a9f28439c1defc1f32af894']['result'], 'IGNORE')
+
+        # Start the Linter again -> should use cache now.
+        linter = MigrationLinter(fixtures.IGNORE_MIGRATION_PROJECT)
+
+        with mock.patch.object(MigrationLinter, 'get_sql', wraps=linter.get_sql)as sql_mock:
+            linter.lint_all_migrations()
+            sql_mock.assert_not_called()
 
     def test_cache_modified(self):
         cache_file = os.path.join(DEFAULT_CACHE_PATH, 'test_project_alter_column.pickle')
diff --git a/tests/functional/test_cmd_line_call.py b/tests/functional/test_cmd_line_call.py
index 8518a9e..d15a9cd 100644
--- a/tests/functional/test_cmd_line_call.py
+++ b/tests/functional/test_cmd_line_call.py
@@ -67,7 +67,7 @@ class CallLinterFromCommandLineTest(unittest.TestCase):
             fixtures.CORRECT_PROJECT)
 
         process = Popen(
-            cmd, shell=True, stdout=PIPE, stderr=sys.stderr)
+            cmd, shell=True, stdout=PIPE, stderr=PIPE)
         process.wait()
         self.assertEqual(process.returncode, 0)
         lines = list(map(utils.clean_bytes_to_str, process.stdout.readlines()))