diff --git a/libavcodec/mjpegenc.c b/libavcodec/mjpegenc.c
index 72c56d20b3..0fb3a17fc3 100644
--- a/libavcodec/mjpegenc.c
+++ b/libavcodec/mjpegenc.c
@@ -215,6 +215,8 @@ static int amv_encode_picture(AVCodecContext *avctx, AVPacket *pkt,
 }
 
 #if CONFIG_MJPEG_ENCODER
+FF_MPV_GENERIC_CLASS(mjpeg)
+
 AVCodec ff_mjpeg_encoder = {
     .name           = "mjpeg",
     .long_name      = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
@@ -228,9 +230,12 @@ AVCodec ff_mjpeg_encoder = {
     .pix_fmts       = (const enum AVPixelFormat[]){
         AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_NONE
     },
+    .priv_class     = &mjpeg_class,
 };
 #endif
 #if CONFIG_AMV_ENCODER
+FF_MPV_GENERIC_CLASS(amv)
+
 AVCodec ff_amv_encoder = {
     .name           = "amv",
     .long_name      = NULL_IF_CONFIG_SMALL("AMV Video"),
@@ -243,5 +248,6 @@ AVCodec ff_amv_encoder = {
     .pix_fmts       = (const enum AVPixelFormat[]){
         AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_NONE
     },
+    .priv_class     = &amv_class,
 };
 #endif