diff --git a/libavformat/pp_bnk.c b/libavformat/pp_bnk.c
index 9455a575b7..18961e301a 100644
--- a/libavformat/pp_bnk.c
+++ b/libavformat/pp_bnk.c
@@ -223,7 +223,7 @@ static int pp_bnk_read_header(AVFormatContext *s)
         par->bits_per_coded_sample  = 4;
         par->bits_per_raw_sample    = 16;
         par->block_align            = 1;
-        par->bit_rate               = par->sample_rate * par->bits_per_coded_sample * par->channels;
+        par->bit_rate               = par->sample_rate * (int64_t)par->bits_per_coded_sample * par->channels;
 
         avpriv_set_pts_info(st, 64, 1, par->sample_rate);
         st->start_time              = 0;