diff --git a/libavcodec/ffwavesynth.c b/libavcodec/ffwavesynth.c
index 3a6a057964..349b45534d 100644
--- a/libavcodec/ffwavesynth.c
+++ b/libavcodec/ffwavesynth.c
@@ -217,8 +217,8 @@ 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) {
-        int64_t pink_ts_cur  = (ws->cur_ts + PINK_UNIT - 1) & ~(PINK_UNIT - 1);
-        int64_t pink_ts_next = ts & ~(PINK_UNIT - 1);
+        uint64_t pink_ts_cur  = (ws->cur_ts + 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);
         if (pos) {