diff --git a/libavcodec/v4l2_buffers.c b/libavcodec/v4l2_buffers.c
index 8e4d4d1c9f..aef911f3bb 100644
--- a/libavcodec/v4l2_buffers.c
+++ b/libavcodec/v4l2_buffers.c
@@ -69,7 +69,8 @@ static inline uint64_t v4l2_get_pts(V4L2Buffer *avbuf)
     int64_t v4l2_pts;
 
     /* convert pts back to encoder timebase */
-    v4l2_pts = avbuf->buf.timestamp.tv_sec * USEC_PER_SEC + avbuf->buf.timestamp.tv_usec;
+    v4l2_pts = (int64_t)avbuf->buf.timestamp.tv_sec * USEC_PER_SEC +
+                        avbuf->buf.timestamp.tv_usec;
 
     return av_rescale_q(v4l2_pts, v4l2_timebase, s->avctx->time_base);
 }