diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index 11e6756..3a44b62 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -33,6 +33,7 @@
 struct v4l2_subscribed_event;
 struct v4l2_fh;
 struct poll_table_struct;
+struct file;
 
 /** struct v4l2_ctrl_ops - The control operations that the driver has to provide.
   * @g_volatile_ctrl: Get a new value for this control. Generally only relevant