diff --git a/libavcodec/dnxhdenc.c b/libavcodec/dnxhdenc.c
index e00b6f67a3..78da1c15e2 100644
--- a/libavcodec/dnxhdenc.c
+++ b/libavcodec/dnxhdenc.c
@@ -433,7 +433,7 @@ static int dnxhd_calc_bits_thread(AVCodecContext *avctx, void *arg, int jobnr, i
             int n = dnxhd_switch_matrix(ctx, i);
 
             memcpy(block, src_block, 64*sizeof(*block));
-            last_index = ctx->m.dct_quantize((MpegEncContext*)ctx, block, i, qscale, &overflow);
+            last_index = ctx->m.dct_quantize(&ctx->m, block, i, qscale, &overflow);
             ac_bits += dnxhd_calc_ac_bits(ctx, block, last_index);
 
             diff = block[0] - ctx->m.last_dc[n];
@@ -478,7 +478,7 @@ static int dnxhd_encode_thread(AVCodecContext *avctx, void *arg, int jobnr, int
             DCTELEM *block = ctx->blocks[i];
             int last_index, overflow;
             int n = dnxhd_switch_matrix(ctx, i);
-            last_index = ctx->m.dct_quantize((MpegEncContext*)ctx, block, i, qscale, &overflow);
+            last_index = ctx->m.dct_quantize(&ctx->m, block, i, qscale, &overflow);
             //START_TIMER;
             dnxhd_encode_block(ctx, block, last_index, n);
             //STOP_TIMER("encode_block");
diff --git a/libavcodec/dnxhdenc.h b/libavcodec/dnxhdenc.h
index 83c0b1cacd..43f65e46dd 100644
--- a/libavcodec/dnxhdenc.h
+++ b/libavcodec/dnxhdenc.h
@@ -39,6 +39,7 @@ typedef struct {
 } RCEntry;
 
 typedef struct DNXHDEncContext {
+    AVClass *class;
     MpegEncContext m; ///< Used for quantization dsp functions
 
     AVFrame frame;