diff --git a/libavdevice/v4l2enc.c b/libavdevice/v4l2enc.c
index efe08b589e..c9f8d92d2b 100644
--- a/libavdevice/v4l2enc.c
+++ b/libavdevice/v4l2enc.c
@@ -22,6 +22,7 @@
 #include "avdevice.h"
 
 typedef struct {
+    AVClass *class;
     int fd;
 } V4L2Context;