diff --git a/libavcodec/ffwavesynth.c b/libavcodec/ffwavesynth.c
index 998e1a4ad6..a446aa2fdf 100644
--- a/libavcodec/ffwavesynth.c
+++ b/libavcodec/ffwavesynth.c
@@ -217,7 +217,7 @@ static void wavesynth_seek(struct wavesynth_context *ws, int64_t ts)
     *last = -1;
     lcg_seek(&ws->dither_state, (uint32_t)ts - (uint32_t)ws->cur_ts);
     if (ws->pink_need) {
-        uint64_t pink_ts_cur  = (ws->cur_ts + PINK_UNIT - 1) & ~(PINK_UNIT - 1);
+        uint64_t pink_ts_cur  = (ws->cur_ts + (uint64_t)PINK_UNIT - 1) & ~(PINK_UNIT - 1);
         uint64_t pink_ts_next = ts & ~(PINK_UNIT - 1);
         int pos = ts & (PINK_UNIT - 1);
         lcg_seek(&ws->pink_state, (uint32_t)(pink_ts_next - pink_ts_cur) * 2);