diff --git a/include/media/v4l2-ioctl.h b/include/media/v4l2-ioctl.h
index f06436d..0da8682 100644
--- a/include/media/v4l2-ioctl.h
+++ b/include/media/v4l2-ioctl.h
@@ -219,7 +219,7 @@
 	int (*vidioc_g_tuner)          (struct file *file, void *fh,
 					struct v4l2_tuner *a);
 	int (*vidioc_s_tuner)          (struct file *file, void *fh,
-					struct v4l2_tuner *a);
+					const struct v4l2_tuner *a);
 	int (*vidioc_g_frequency)      (struct file *file, void *fh,
 					struct v4l2_frequency *a);
 	int (*vidioc_s_frequency)      (struct file *file, void *fh,