diff --git a/avocado/core/plugin_interfaces.py b/avocado/core/plugin_interfaces.py
index 6bb194dfcc8ff733251359c6bdefc3ec743faa9b..8ab02bb1ac8b2f6d59d76983611df7ceb8651396 100644
--- a/avocado/core/plugin_interfaces.py
+++ b/avocado/core/plugin_interfaces.py
@@ -16,9 +16,7 @@
 import abc
 
 
-class Plugin:
-
-    __metaclass__ = abc.ABCMeta
+class Plugin(metaclass=abc.ABCMeta):
 
     """
     Base for all plugins
diff --git a/selftests/unit/test_plugin_interfaces.py b/selftests/unit/test_plugin_interfaces.py
new file mode 100644
index 0000000000000000000000000000000000000000..2bc2769cb1422e64471d17f0712abc061c0f6820
--- /dev/null
+++ b/selftests/unit/test_plugin_interfaces.py
@@ -0,0 +1,56 @@
+import unittest
+
+from avocado.core import plugin_interfaces
+
+
+class Plugin(unittest.TestCase):
+
+    def test_instantiate_settings(self):
+        with self.assertRaises(TypeError):
+            # pylint: disable=E0110
+            plugin_interfaces.Settings()
+
+    def test_instantiate_cli(self):
+        with self.assertRaises(TypeError):
+            # pylint: disable=E0110
+            plugin_interfaces.CLI()
+
+    def test_instantiate_cli_cmd(self):
+        with self.assertRaises(TypeError):
+            # pylint: disable=E0110
+            plugin_interfaces.CLICmd()
+
+    def test_instantiate_job_pre(self):
+        with self.assertRaises(TypeError):
+            # pylint: disable=E0110
+            plugin_interfaces.JobPre()
+
+    def test_instantiate_job_post(self):
+        with self.assertRaises(TypeError):
+            # pylint: disable=E0110
+            plugin_interfaces.JobPost()
+
+    def test_instantiate_result(self):
+        with self.assertRaises(TypeError):
+            # pylint: disable=E0110
+            plugin_interfaces.Result()
+
+    def test_instantiate_job_pre_tests(self):
+        with self.assertRaises(TypeError):
+            # pylint: disable=E0110
+            plugin_interfaces.JobPreTests()
+
+    def test_instantiate_job_post_tests(self):
+        with self.assertRaises(TypeError):
+            # pylint: disable=E0110
+            plugin_interfaces.JobPostTests()
+
+    def test_instantiate_result_events(self):
+        with self.assertRaises(TypeError):
+            # pylint: disable=E0110
+            plugin_interfaces.ResultEvents()
+
+    def test_instantiate_varianter(self):
+        with self.assertRaises(TypeError):
+            # pylint: disable=E0110
+            plugin_interfaces.Varianter()