diff --git a/libavcodec/bonk.c b/libavcodec/bonk.c
index 5d736b1563..9e176d5477 100644
--- a/libavcodec/bonk.c
+++ b/libavcodec/bonk.c
@@ -356,7 +356,7 @@ static int bonk_decode(AVCodecContext *avctx, AVFrame *frame,
                 sample++;
             }
 
-            sample[0] = predictor_calc_error(s->k, state, s->n_taps, s->input_samples[i] * quant);
+            sample[0] = predictor_calc_error(s->k, state, s->n_taps, s->input_samples[i] * (unsigned)quant);
             sample++;
         }