diff --git a/libavdevice/libcdio.c b/libavdevice/libcdio.c
index be1c516..7218788 100644
--- a/libavdevice/libcdio.c
+++ b/libavdevice/libcdio.c
@@ -37,6 +37,7 @@
 #undef free
 
 typedef struct CDIOContext {
+    const AVClass       *class;
     cdrom_drive_t       *drive;
     cdrom_paranoia_t *paranoia;
     int32_t last_sector;