diff --git a/libavcodec/wmaprodec.c b/libavcodec/wmaprodec.c
index f32e4c2931..8e026ba7c4 100644
--- a/libavcodec/wmaprodec.c
+++ b/libavcodec/wmaprodec.c
@@ -473,7 +473,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
     /** calculate subwoofer cutoff values */
     for (i = 0; i < num_possible_block_sizes; i++) {
         int block_size = s->samples_per_frame >> i;
-        int cutoff = (440*block_size + 3 * (s->avctx->sample_rate >> 1) - 1)
+        int cutoff = (440*block_size + 3LL * (s->avctx->sample_rate >> 1) - 1)
                      / s->avctx->sample_rate;
         s->subwoofer_cutoffs[i] = av_clip(cutoff, 4, block_size);
     }