diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index 82b7acd1ee..cee16e7577 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -4109,10 +4109,10 @@ int main(void){
     uint8_t temp[SIZE];
     PutBitContext pb;
     GetBitContext gb;
-//    int int_temp[10000];
     DSPContext dsp;
     AVCodecContext avctx;
 
+    avctx.av_class = avcodec_get_class();
     dsputil_init(&dsp, &avctx);
 
     init_put_bits(&pb, temp, SIZE);