diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index 7ef6b27..6890f5e 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -546,7 +546,7 @@
 /* Can be used as a vidioc_subscribe_event function that just subscribes
    control events. */
 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
-				struct v4l2_event_subscription *sub);
+				const struct v4l2_event_subscription *sub);
 
 /* Can be used as a poll function that just polls for control events. */
 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait);
diff --git a/include/media/v4l2-event.h b/include/media/v4l2-event.h
index 2885a81..e7c5d17 100644
--- a/include/media/v4l2-event.h
+++ b/include/media/v4l2-event.h
@@ -124,10 +124,10 @@
 void v4l2_event_queue_fh(struct v4l2_fh *fh, const struct v4l2_event *ev);
 int v4l2_event_pending(struct v4l2_fh *fh);
 int v4l2_event_subscribe(struct v4l2_fh *fh,
-			 struct v4l2_event_subscription *sub, unsigned elems,
+			 const struct v4l2_event_subscription *sub, unsigned elems,
 			 const struct v4l2_subscribed_event_ops *ops);
 int v4l2_event_unsubscribe(struct v4l2_fh *fh,
-			   struct v4l2_event_subscription *sub);
+			   const struct v4l2_event_subscription *sub);
 void v4l2_event_unsubscribe_all(struct v4l2_fh *fh);
 
 #endif /* V4L2_EVENT_H */
diff --git a/include/media/v4l2-ioctl.h b/include/media/v4l2-ioctl.h
index 865f95d..3eef4de 100644
--- a/include/media/v4l2-ioctl.h
+++ b/include/media/v4l2-ioctl.h
@@ -273,9 +273,9 @@
 				    struct v4l2_dv_timings_cap *cap);
 
 	int (*vidioc_subscribe_event)  (struct v4l2_fh *fh,
-					struct v4l2_event_subscription *sub);
+					const struct v4l2_event_subscription *sub);
 	int (*vidioc_unsubscribe_event)(struct v4l2_fh *fh,
-					struct v4l2_event_subscription *sub);
+					const struct v4l2_event_subscription *sub);
 
 	/* For other private ioctls */
 	long (*vidioc_default)	       (struct file *file, void *fh,