diff --git a/mpv.py b/mpv.py
index 0de35a4..18dec07 100644
--- a/mpv.py
+++ b/mpv.py
@@ -1448,7 +1448,7 @@ class MPV(object):
         """Mapped mpv discnav command, see man mpv(1)."""
         self.command('discnav', command)
 
-    def mouse(x, y, button=None, mode='single'):
+    def mouse(self, x, y, button=None, mode='single'):
         """Mapped mpv mouse command, see man mpv(1)."""
         if button is None:
             self.command('mouse', x, y, mode)