diff --git a/libavcodec/cngenc.c b/libavcodec/cngenc.c
index 302c703f72..e185c4a40a 100644
--- a/libavcodec/cngenc.c
+++ b/libavcodec/cngenc.c
@@ -91,7 +91,7 @@ static int cng_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
     } else {
         qdbov = 127;
     }
-    ret = ff_lpc_calc_ref_coefs(&p->lpc, p->samples32, p->order, p->ref_coef);
+    ff_lpc_calc_ref_coefs(&p->lpc, p->samples32, p->order, p->ref_coef);
     avpkt->data[0] = qdbov;
     for (i = 0; i < p->order; i++)
         avpkt->data[1 + i] = p->ref_coef[i] * 127 + 127;