diff --git a/mopidy/core/listener.py b/mopidy/core/listener.py
index c93fc39e..5afb3f4f 100644
--- a/mopidy/core/listener.py
+++ b/mopidy/core/listener.py
@@ -132,11 +132,14 @@ class CoreListener(object):
         """
         pass
 
-    def volume_changed(self):
+    def volume_changed(self, volume):
         """
         Called whenever the volume is changed.
 
         *MAY* be implemented by actor.
+
+        :param volume: the new volume in the range [0..100]
+        :type volume: int
         """
         pass
 
diff --git a/tests/core/listener_test.py b/tests/core/listener_test.py
index bf3a235d..d1773a12 100644
--- a/tests/core/listener_test.py
+++ b/tests/core/listener_test.py
@@ -49,7 +49,7 @@ class CoreListenerTest(unittest.TestCase):
         self.listener.options_changed()
 
     def test_listener_has_default_impl_for_volume_changed(self):
-        self.listener.volume_changed()
+        self.listener.volume_changed(70)
 
     def test_listener_has_default_impl_for_seeked(self):
         self.listener.seeked(0)