diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 1a82a50..79784fc 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -194,7 +194,7 @@
 	int (*s_frequency)(struct v4l2_subdev *sd, const struct v4l2_frequency *freq);
 	int (*g_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq);
 	int (*g_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt);
-	int (*s_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt);
+	int (*s_tuner)(struct v4l2_subdev *sd, const struct v4l2_tuner *vt);
 	int (*g_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm);
 	int (*s_modulator)(struct v4l2_subdev *sd, const struct v4l2_modulator *vm);
 	int (*s_type_addr)(struct v4l2_subdev *sd, struct tuner_setup *type);