diff --git a/libavcodec/j2kdec.c b/libavcodec/j2kdec.c
index b375767797..0c88ba9423 100644
--- a/libavcodec/j2kdec.c
+++ b/libavcodec/j2kdec.c
@@ -48,6 +48,7 @@ typedef struct Jpeg2000Tile {
 } Jpeg2000Tile;
 
 typedef struct Jpeg2000DecoderContext {
+    AVClass         *class;
     AVCodecContext  *avctx;
     AVFrame         *picture;
     GetByteContext  g;